yatou8100
幼苗
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a number of 意思是“许多...”,后接复数名词,谓语通常用复数:
A number of students were absent from the meeting.
许多学生没有到会.
可加不可数名词
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A number of water pollution sources exist in the upstream of Shahe reservoir in Tianmu Lake tourism resort. 天目湖旅游度假区沙河水库上游存在多种水体污染来源,这些污染物质可通过雨水径流进入库区。