free period
US /ˈfriː ˌpɪr.i.əd/
UK /ˈfriː ˌpɪr.i.əd/
1.
空閒時間, 自習課
a period during the school day when a student does not have a class and is free to do other things
:
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During my free period, I usually go to the library to study.
在我的空閒時間，我通常去圖書館學習。
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Do you have a free period next?
你接下來有空閒時間嗎？