دائما يستعمل الزوار المنظار في موقع المشاهدة.

Because in standard Arabic, when the verb comes before the subject, the verb is often singular and only agrees in gender, not full number.

So:

• يستعمل الزوار = literally use(s) the visitors
• but naturally it means the visitors use

Since الزوار is a masculine human plural, the verb before it appears in the 3rd person masculine singular form: يستعمل.

If you put the subject first, then full agreement is normal:

• الزوار يستعملون المنظار

So both are correct, but the agreement changes with the word order.

دائما means always, and here it functions as an adverb of frequency.

It often appears in the accusative adverbial form, which is why it ends in ـًا in fully vocalized Arabic:

• دَائِمًا

This -an ending does not mean it is the direct object. It is simply the normal adverbial accusative form here.

In careful MSA reading, you would pronounce it dāʾiman. In pause, many speakers soften or drop the final short ending.

If fully vowelled, the sentence is:

دَائِمًا يَسْتَعْمِلُ الزُّوَّارُ الْمِنْظَارَ فِي مَوْقِعِ الْمُشَاهَدَةِ

The noun roles are:

• الزوارُ: the subject of the verb, so it is nominative
• المنظارَ: the direct object, so it is accusative
• موقعِ: after the preposition في, so it is genitive
• المشاهدةِ: second term of an iḍāfa construction, so it is also genitive

So the basic structure is:

• دائما = adverb
• يستعمل = verb
• الزوار = subject
• المنظار = object
• في موقع المشاهدة = prepositional phrase of place

Because this is an iḍāfa construction, often called a genitive/construct phrase.

• موقع = site/location
• المشاهدة = viewing/observation

Together, موقع المشاهدة means the viewing site or observation site.

In an iḍāfa:

• the first noun usually does not take الـ
• the second noun can be definite
• if the second noun is definite, the whole phrase becomes definite

So:

• موقع المشاهدة = the viewing site
• not a viewing site

That is why موقع appears without الـ.

It is a prepositional phrase:

• في = in / at
• موقع المشاهدة = the viewing site

So the whole phrase means:

• at the viewing site
• in the observation area
• at the lookout point

Grammatically, it tells you where the action happens.

Because both are being treated as definite nouns.

• الزوار = the visitors / visitors in a known or generic group
• المنظار = the telescope / the viewing instrument

Arabic often uses the definite article more freely than English, especially when the thing is:

• already known from context
• generic within a situation
• the expected item in a place

So even if English might sometimes say visitors use a telescope, Arabic may naturally say الزوار يستعملون المنظار if the telescope is understood as the one available there.

المنظار comes from the root related to looking/seeing (ن ظ ر).

Depending on context, it can mean things like:

• telescope
• binoculars
• viewing scope
• optical viewer

In this sentence, because it is in a viewing site / observation location, it most likely means:

• the telescope
• the viewing scope

So the exact English word depends on the real-life setting.

Because ز is a sun letter.

When الـ comes before a sun letter, the ل sound assimilates into the next consonant in pronunciation.

So:

• written: الزوار
• pronounced: az-zuwwār

But the spelling stays the same.

This is normal for words beginning with sun letters such as:

• الشمس → ash-shams
• الناس → an-nās
• الزوار → az-zuwwār

Yes. Arabic allows more than one word order, though the style and agreement may change.

This sentence uses a common verb-first structure:

• دائما يستعمل الزوار المنظار في موقع المشاهدة

You could also say:

• الزوار يستعملون المنظار دائما في موقع المشاهدة

Here the subject comes first, so the verb changes to full plural agreement:

• يستعملون instead of يستعمل

Both are correct. The difference is mostly one of style, focus, and sentence rhythm.

They are very close in meaning.

• يستعمل = uses, employs
• يستخدم = uses

In many contexts, they are interchangeable.

So you could also say:

• دائما يستخدم الزوار المنظار في موقع المشاهدة

Both sound natural in MSA. Sometimes one may sound slightly more typical in a certain context, but for a learner, they are near-synonyms here.

A fully vowelled version is:

دَائِمًا يَسْتَعْمِلُ الزُّوَّارُ الْمِنْظَارَ فِي مَوْقِعِ الْمُشَاهَدَةِ

A helpful pronunciation guide is:

dāʾiman yastaʿmilu az-zuwwāru al-minẓāra fī mawqiʿi al-mushāhadati

A few notes:

• دائما = dāʾiman
• يستعمل = yastaʿmilu
• الزوار = az-zuwwāru because of sun-letter assimilation
• المنظار = al-minẓāra
• موقع = mawqiʿ
• المشاهدة = al-mushāhada

In normal pausal reading, final short case vowels are often not fully pronounced.