studyingv.学习;攻读；审视；端详；细看；研究；调查；study的现在分词；
study就可以做名词了 可以可数也可以不可数；
研究；调查；研究成果 是可数名词；
学习；研究 是不可数名词
He\'s studying music in his spare time.
他在空闲时间学音乐。
I am studying Chinese.
我正在学中文。
The students were questioned on the books they had been studying.
学生被问到有关他们所学课本内容的问题。
