a number of 意思是“許多...”,后接復(fù)數(shù)名詞,謂語通常用復(fù)數(shù)：
A number of students were absent from the meeting.
許多學(xué)生沒有到會(huì).
可加不可數(shù)名詞可以舉個(gè)加不可數(shù)名詞的句子嗎？A number of water pollution sources exist in the upstream of Shahe reservoir in Tianmu Lake tourism resort.天目湖旅游度假區(qū)沙河水庫上游存在多種水體污染來源，這些污染物質(zhì)可通過雨水徑流進(jìn)入庫區(qū)。