هذا مجال عمل جديد.

Because Arabic often leaves out the verb to be in the present tense.

So هذا مجال عمل جديد literally looks like:

• this
• field of work
• new

But it means This is a new field of work.

If you wanted was, Arabic would normally use a verb, for example:

• كان هذا مجالَ عملٍ جديدًا = This was a new field of work

Because مجال is a masculine singular noun, and هذا is the demonstrative used with masculine singular nouns.

• هذا = this for masculine singular
• هذه = this for feminine singular

So:

• هذا مجال = this is a field/domain
• If the noun were feminine, you would use هذه

هذا means this.

In a sentence like this, it points to something and introduces it:

• هذا كتاب = This is a book
• هذا مجال عمل جديد = This is a new field of work

So هذا is doing the job of this in English, even though Arabic does not need a separate word for is here.

Arabic has no indefinite article like English a/an.

A noun is usually understood as indefinite when it does not have الـ (the) and is not made definite in some other way.

So in this sentence:

• مجال = a field / a domain
• عمل = work
• جديد = new

This gives the sense a new field of work, even though Arabic does not use a separate word for a.

Yes. مجال عمل is an iḍāfa structure, often called a construct phrase.

It is made of:

• مجال = field, area, domain
• عمل = work

Together, they mean something like:

• field of work
• area of work
• line of work

A few important things about iḍāfa:

• the first noun does not take الـ here
• the second noun is in a genitive relationship: of work
• the whole phrase acts like one noun phrase

So مجال عمل is not just two random nouns next to each other; it is a grammatical unit meaning field of work.

Because adjectives normally come after the noun in Arabic.

So:

• كتاب جديد = a new book
• مجال عمل جديد = a new field of work

This is the opposite of normal English word order, where adjectives usually come before the noun.

It describes مجال, not عمل.

So the meaning is:

• a new field of work

not:

• a field of new work

Why? Because in the phrase مجال عمل جديد, the adjective جديد comes after the whole noun phrase and agrees with the head noun مجال.

If you wanted to say a field of new work, you would structure it differently so that new clearly describes work.

A fully vowelled version is:

هَذَا مَجَالُ عَمَلٍ جَدِيدٌ

A simple breakdown:

• هَذَا = this
• مَجَالُ = predicate noun, nominative
• عَمَلٍ = second part of the iḍāfa, genitive
• جَدِيدٌ = adjective describing مجال, nominative

So the grammar is roughly:

• هذا = subject-like demonstrative
• مجالُ عملٍ جديدٌ = predicate phrase

In normal reading or conversation, learners often hear it without paying much attention to the final short vowels:

• hādhā majāl ʿamal jadīd

But in careful MSA grammar, the full endings matter.

مجال can mean several related things, depending on context:

• field
• area
• domain
• sphere

So هذا مجال عمل جديد could be translated naturally as:

• This is a new field of work
• This is a new line of work
• This is a new area of work

The exact best translation depends on context, but the basic idea is a new professional area or type of work.

Yes. It is a perfectly normal complete Arabic sentence.

Arabic often uses nominal sentences, especially in the present tense. A nominal sentence can be complete with:

• a topic or pointer like هذا
• a predicate like مجال عمل جديد

So even though it is short, it fully means:

• This is a new field of work