nidai ha tuyoi.

It is usually read にだい.

• 荷 = load, cargo, baggage
• 台 = platform, stand, bed

As a word, 荷台 often refers to a truck bed, loading platform, or cargo area, depending on context.

は marks the topic of the sentence.

So 荷台は強い means something like:

• As for the cargo platform, it is strong
• The truck bed is strong

The topic is what the sentence is talking about, and the rest of the sentence gives information about that topic.

This is a very common beginner question.

When は is used as the topic particle, it is pronounced わ.

So:

• written: 荷台は強い
• read aloud: にだい は つよい → with は pronounced wa

But when は is part of a normal word, it is usually pronounced ha.

Because 強い is an i-adjective, and i-adjectives can act as the predicate by themselves.

So Japanese does not need a separate word like is here.

• 荷台は強い。 = The cargo bed is strong.

This is different from English, where you need is.

Yes. 強い is an i-adjective.

It describes something as strong. In Japanese, i-adjectives can end a sentence on their own, so 強い is doing the job of is strong.

That is why:

• 荷台は強い。 is a complete sentence.

Both can sometimes be possible, but they give slightly different nuance.

• 荷台は強い。 = As for the cargo bed, it is strong.
  This presents 荷台 as the topic.

• 荷台が強い。 = The cargo bed is the one that is strong / It is the cargo bed that is strong.
  This can sound more focused or contrastive, depending on context.

For a simple neutral statement about a known topic, は is very natural.

Here, 強い most likely means strong, sturdy, or able to withstand force/weight.

With an object like 荷台, English might sometimes naturally say:

• The truck bed is sturdy.
• The loading platform is durable.
• The cargo area is strong.

So the exact English wording depends on context, but the basic idea is that the 荷台 is structurally strong.

Yes, very possibly.

A learner may notice that 丈夫だ often sounds natural for things that are durable, sturdy, or well-built.

• 荷台は丈夫だ。 = The cargo bed is sturdy / durable.

The difference is roughly:

• 強い often emphasizes strength
• 丈夫だ often emphasizes durability / toughness / solid construction

In real-life usage, one may sound more natural than the other depending on what exactly the speaker wants to emphasize.

荷台は強い。 is in the plain form.

It is normal in:

• casual speech
• dictionary examples
• written explanations
• neutral statements

A more polite version would be:

• 荷台は強いです。

Both mean the same thing, but 強いです is more polite.

You are right: Japanese normally does not use spaces like this.

In ordinary writing, it would usually be:

• 荷台は強い。

Spaces are often added in learning materials to make the parts easier to see:

• 荷台 = noun
• は = topic particle
• 強い = i-adjective

So the spaces are just a teaching aid.

The pattern is:

• Noun + は + i-adjective

In this sentence:

• 荷台 = noun
• は = topic marker
• 強い = predicate adjective

So the structure is:

• As for X, it is Y

This is a very common Japanese sentence pattern.

Grammatically, it can stand alone just fine.

But in real conversation, a sentence like 荷台は強い。 often sounds most natural when there is some context, such as:

• comparing vehicles
• talking about load capacity
• describing equipment
• discussing construction quality

So it is a complete sentence, but the exact nuance becomes clearer from the situation.