1
a great deal of + [uncountable noun]
后接不可数名词，表示数量多。
She has a great deal of experience in marketing.
她在市场营销方面有大量经验。
很多；非常；大量
先理解核心含义，再看它在真实句子里的用法。
很多；非常；大量
Very much; to a great extent; a lot; lots.
She has a great deal of experience in marketing.
她在市场营销方面有大量经验。
非常；在很大程度上；很多；大量。
Very much; to a great extent; a lot; lots.
She has learned a great deal from her travels.
她从旅行中学到了大量东西。
He spends a great deal of time reading.
他花大量时间阅读。
The project requires a great deal of money.
这个项目需要大量资金。
后接不可数名词，表示数量多。
She has a great deal of experience in marketing.
她在市场营销方面有大量经验。
修饰动词，表示程度深。
He knows a great deal about ancient history.
他对古代历史了解很多。
用于修饰比较级，强调程度大。
This method is a great deal more efficient.
这种方法高效得多。
Not this
He has a great deal books.
Use this
He has a great deal of books.
a great deal 后面必须接 of 才能修饰名词，表示“大量的”；直接接名词是缺少介词的错误。
Not this
She bought a great deal of apples.
Use this
She bought a lot of apples.
a great deal of 只能修饰不可数名词，apples 是可数名词，应用 a lot of 或 a great many。
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Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
Use a great deal naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
仅作程度副词，不充当主语或宾语，也不直接后接名词；表示数量需改用其他结构。
Dictionary facts from ECDICT, WIKTIONARY.