Ons beklemtoon die wanddikte.

Here ons means we because it is the subject of the sentence.

A useful extra point: ons can also mean us or our in other contexts, so you have to tell from the sentence structure which role it has. In Ons beklemtoon die wanddikte, it clearly means we.

It is capitalized here only because it is the first word of the sentence.

In Afrikaans, verbs usually do not change form for different subjects in the present tense.

So you get:

• Ek beklemtoon
• Jy beklemtoon
• Hy beklemtoon
• Ons beklemtoon

That is much simpler than English, where you have forms like I emphasize but he emphasizes.

Yes. Beklemtoon is a normal verb meaning to emphasize / to stress.

In this sentence it is being used as the finite verb in the present tense. It directly takes an object, so you can say:

• Ons beklemtoon die punt.
• Sy beklemtoon die verskil.
• Hulle beklemtoon die wanddikte.

You do not need a preposition after it in this kind of sentence.

It is written as one word: beklemtoon.

That is the normal spelling of the verb. In this sentence it stays together and does not split.

Die is the definite article, so here it means the.

A very important Afrikaans point is that die does not change for grammatical gender. Afrikaans does not have separate words like masculine/feminine/neuter articles in the way some other languages do.

Also, die can be used for both singular and plural nouns:

• die muur = the wall
• die mure = the walls

Here it introduces the noun wanddikte.

Afrikaans, like Dutch and German, very often forms compound nouns by writing them as a single word.

So:

• wand = wall
• dikte = thickness
• wanddikte = wall thickness

English often writes these as two words, but Afrikaans normally joins them into one compound noun.

In this sentence, yes: it is basically subject + verb + object.

So:

• Ons = subject
• beklemtoon = verb
• die wanddikte = object

However, Afrikaans follows a verb-second pattern in main clauses. That means if you start with another element, the verb still comes second:

• Vandag beklemtoon ons die wanddikte.

So the simple sentence looks English-like, but the full system is not always exactly the same as English.

No. Die wanddikte is the direct object of beklemtoon, so no extra word is needed.

That is why the sentence is simply:

• Ons beklemtoon die wanddikte.

Not:

• Ons beklemtoon op die wanddikte
• Ons beklemtoon aan die wanddikte

Those would be incorrect here.

It is a technical or descriptive noun meaning the thickness of a wall or side of something.

Depending on context, it can refer to:

• a literal wall
• the wall of a pipe
• the wall of a container
• the wall of a mechanical part

So it is often used in technical, engineering, or manufacturing contexts, not only for the wall of a building.