是可数名词,意思是摘录,引文例如:

1、For ease of reference, only the relevant extracts of the regulations are included.为了便于参照,仅摘录相关规则。

2、The author extracts the maximum from every carefully-crafted scene in this witty tale.作者从这个妙趣横生的故事的每一个精心构思的情节中都摘录了尽可能多的内容。