现在进行时：is/are studying
Several notable researchers are studying the effects of hyperventilation.
几位著名的研究人员正在研究呼吸急促的后果。
My nephew is studying abroad.
我的外甥在国外学习。
He is studying chemistry.
他在研究化学。
He is studying physics.
他在研究物理。
He is studying French.
他在学习法语。
My nephew is studying and working abroad.
我外甥在国外学习和工作。
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