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большое количество

a large amount; a large number

→ большой
phrase Rare #32,334
a large amount; a large number Used with a genitive noun to refer to a large quantity of something. The adjective agrees with количество, which is neuter singular.
RU: В библиотеке большое количество старых книг.
EN: There are a large number of old books in the library.

Это большое количество.

That's a large quantity.

У него большое количество книг.

He has a large number of books.

Думается, что жертва приняла большое количество яда случайно.

It is thought that the victim accidentally ingested a large amount of poison.