qítā shēnqǐngcáiliào dōu qíquán.

都 means all and shows that the statement applies to the whole group.

In this sentence:

• 其他申请材料 = the other application materials
• 都 = all
• 齐全 = complete / all present

So 都 tells you that all of the other application materials are complete.

A useful pattern is:

A 都 + adjective / verb

For example:

• 这些文件都对。 = These documents are all correct.
• 人都到了。 = Everyone has arrived.

Here, 都 goes before the predicate 齐全.

Because 齐全 is an adjective-like predicate in Chinese, and Chinese usually does not use 是 before ordinary adjectives.

So:

• 材料齐全。 = The materials are complete.
• not 材料是齐全。 in normal usage

This is very common in Mandarin:

• 他很忙。 = He is busy.
• 这个问题很重要。 = This question is important.

Chinese often lets adjectives act like verbs/statements by themselves.

齐全 means something like:

• complete
• all present
• nothing is missing

It is often used when talking about sets of things that are required or expected, especially documents, equipment, forms, or items on a list.

So with 申请材料 it means the application materials are all there and nothing required is missing.

It does not mainly mean perfect or high quality. It focuses on having all the necessary parts/items.

For example:

• 证件都齐全。 = All the documents are in order / complete.
• 设备齐全。 = The equipment is fully provided / complete.

Because 其他 directly modifies the noun 申请材料, and in this kind of phrase, 的 is normally omitted.

So:

• 其他申请材料 = other application materials

This is the normal, natural form.

You can think of 其他 as functioning like an adjective here, similar to:

• 新学生 = new students
• 重要问题 = important questions
• 中文老师 = Chinese teacher

Using 其他的申请材料 is sometimes possible, but 其他申请材料 is usually more concise and more natural in formal written contexts.

By itself, 申请材料 does not show singular or plural. Chinese nouns usually do not change form for number.

So 申请材料 can mean:

• application material
• application materials

The context tells you which is meant.

In this sentence, 都 strongly suggests a plural or collective meaning, so the natural interpretation is:

the other application materials are all complete

The structure is:

其他申请材料 + 都 + 齐全

That is:

• subject/topic: 其他申请材料
• adverb: 都
• predicate: 齐全

So literally, it is something like:

The other application materials all complete.

A more natural English version is:

The other application materials are all complete.

This is a very common Chinese pattern:
noun phrase + 都 + adjective/verb

Yes, 别的申请材料都齐全 is understandable and grammatically fine.

But there is a style difference:

• 其他 is more formal and common in written or administrative language
• 别的 is more conversational

Since 申请材料 is itself a formal expression, 其他申请材料都齐全 sounds especially natural in an office, school, or application context.

So:

• 其他申请材料都齐全。 = more formal / official
• 别的申请材料都齐全。 = more casual speech

These words can all relate to completeness, but they are not exactly the same.

齐全

• all required items are present
• nothing is missing
• very common for documents, equipment, materials

完整

• whole, intact, not broken, not lacking parts
• often emphasizes structural wholeness

完备

• complete and well-prepared
• more formal, often used in written language or abstract systems

In this sentence, 齐全 is the best fit because application materials are a set of required items, and the point is that all of them are present.

Yes. In context, 其他 often feels like the other / the remaining.

So depending on the situation, 其他申请材料都齐全 can mean:

• the other application materials are all complete
• the rest of the application materials are all there

For example, if one document is still missing but everything else has been submitted, someone might say this sentence to mean:

All the other application materials are complete.

Yes, it sounds fairly formal and very natural in administrative or institutional contexts, such as:

• school applications
• visa applications
• job applications
• official document checks

That formality comes especially from:

• 申请材料 = application materials
• 其他 = other, in a formal style
• 齐全 = complete / all present, often used in document-checking language

So this sounds like something a staff member might say.

Yes. Adding 了 often gives a sense of change of state or now the situation is so.

Compare:

• 其他申请材料都齐全。 = The other application materials are all complete.
• 其他申请材料都齐全了。 = The other application materials are all complete now.

The version with 了 can imply that previously they were not all complete, but now they are.

That makes 了 useful if you want to emphasize that the set has just become complete.

A natural pronunciation is:

qítā shēnqǐng cáiliào dōu qíquán

A few notes:

• 其他 qítā: second tone + first tone
• 申请 shēnqǐng: first tone + third tone
• 材料 cáiliào: second tone + fourth tone
• 都 dōu: first tone
• 齐全 qíquán: second tone + second tone

When spoken naturally, 申请材料 is said as one chunk, and 都齐全 also flows together smoothly.

A useful rhythm is:

其他 / 申请材料 / 都齐全

This helps the sentence sound more natural instead of word-by-word.