zhè gè bówùguǎn bú dà, dànshì lǐbian de zhǎnlǎn hěn yǒuyìsi, cānguān wán yǐhòu dàjiā dōu hěn gāoxìng.

Chinese usually needs a measure word between 这 (this) and a noun.

So the pattern is:

这 + measure word + noun

Here, 个 is the general measure word:

这个博物馆 = this museum

In everyday speech, 个 is very common and works with many nouns, although some nouns have more specific measure words.

This is because of a common tone change rule.

不 is normally fourth tone: bù.
But when it comes before another fourth-tone syllable, it changes to second tone:

• 不大 → bú dà
• 不是 → bú shì
• 不要 → bú yào

Since 大 is fourth tone, 不 changes to bú here.

Both can work, but they are not exactly the same in feeling.

• 小 = small
• 不大 = not big

不大 often sounds a little softer and less direct. It can suggest:

• the museum is not large,
• but the speaker is not strongly emphasizing that it is small.

So 这个博物馆不大 feels natural and slightly more moderate than 这个博物馆很小.

Because in Chinese, adjectives can act as predicates directly.

So you can say:

• 这个博物馆不大。
• 展览很有意思。
• 大家很高兴。

You do not need 是 before adjectives in these cases.

English says The museum is not big, but Chinese often says more literally:

This museum not big.

Using 是 before an adjective is usually incorrect in a simple sentence like this.

里边的展览 means:

the exhibitions inside / the exhibits in it

Breakdown:

• 里边 = inside, in there
• 的 = links a descriptive phrase to a noun
• 展览 = exhibition(s), displays

So the structure is:

[place/description] + 的 + noun

Examples:

• 学校的老师 = the school's teachers / the teachers at the school
• 桌子上的书 = the books on the table
• 里边的展览 = the exhibitions inside

Here, 的 turns 里边 into something like the inside ones modifying 展览.

They both mean inside or in it, and in many cases they are interchangeable.

• 里面
• 里边

里边 can sound a little more colloquial in some contexts, and sometimes a bit more northern in flavor, but both are very common.

So you could also say:

但是里面的展览很有意思。

That would still sound natural.

Not always. This is a very common point for learners.

In Chinese, when an adjective is the main predicate, 很 is often used even when the meaning is just neutral, not strongly very.

So:

• 展览很有意思 often means The exhibitions are interesting
• 大家都很高兴 often means Everyone was happy

Here, 很 may be felt as a light linker rather than a strong very.

Without 很, the sentence can sound contrastive or incomplete in many contexts.

Compare:

• 他很高兴。 = He is happy.
• 他高兴。 = Can sound marked, literary, or contrastive depending on context.

有意思 usually means:

• interesting
• engaging
• fun
• thought-provoking

Literally, it is have meaning/interest, but in real usage it often just means interesting.

So:

展览很有意思 = The exhibitions are very interesting / quite interesting

Be aware that 有意思 can sometimes also mean meaningful or even funny/curious, depending on context, but interesting is the best reading here.

但是 means but or however.

It connects two parts:

• 这个博物馆不大
• 但是里边的展览很有意思

So the sentence contrasts:

• the museum is not big,
• but the exhibitions inside are interesting.

This is a very common way to balance two ideas in Chinese.

It means:

after finishing the visit / after visiting

Breakdown:

• 参观 = to visit (a place such as a museum, exhibition, factory, etc.)
• 完 = finish, complete
• 以后 = after

So:

参观完以后 = after finishing visiting

This uses a common Chinese pattern:

verb + 完 + 以后

Examples:

• 吃完以后 = after eating
• 看完以后 = after finishing reading/watching
• 参观完以后 = after finishing the visit

Because 完 is a result complement. It shows that the action has been completed.

Structure:

verb + 完

So:

• 看完 = finish reading/watching
• 做完 = finish doing
• 参观完 = finish visiting

It is not a separate full verb here; it follows the main verb and tells you the action reached completion.

Yes, but the meaning would be slightly different in feel.

• 参观了以后 = after visiting
• 参观完以后 = after finishing the visit

完 emphasizes completion more clearly. In this sentence, that emphasis fits well because the next clause describes how everyone felt once the visit was over.

So both are possible, but 参观完以后 is a bit more explicit and natural here.

都 means all or both, depending on context.

Here:

• 大家 = everyone
• 都 = all
• 很高兴 = happy

So:

大家都很高兴 = Everyone was happy

Even though 大家 already has the idea of a group, 都 is still commonly used to show that the statement applies to all members of that group.

It is very natural to say:

• 我们都知道。 = We all know.
• 他们都来了。 = They all came.
• 大家都很高兴。 = Everyone was happy.

Both are possible in other contexts, but they express different things.

• 高兴 = happy, pleased
• 喜欢 = like

This sentence focuses on the visitors' emotional result after the visit:

参观完以后大家都很高兴
= After the visit, everyone was happy

If you said 大家都很喜欢, it would usually need an object:

• 大家都很喜欢这个博物馆。
• 大家都很喜欢这些展览。

So 高兴 works especially well here because it describes the final feeling.

It can be divided into three parts:

1. 这个博物馆不大
   = This museum is not big.

2. 但是里边的展览很有意思
   = But the exhibitions inside are interesting.

3. 参观完以后大家都很高兴
   = After finishing the visit, everyone was happy.

So the sentence moves like this:

• first, describe the museum's size,
• then contrast that with the quality of the exhibits,
• finally, give the result: everyone enjoyed the visit and felt happy.

That kind of flow is very common in natural Chinese.