An abstract idea or notion; a unit of thought.
一个抽象的观念或想法；一个思维单位。
Can you add and advice you thought of in Unit 1, Acitivity 7?
你能补充一些你在第1单元活动7中所想到的建议吗？
Electric potential can be thought of as potential energy per unit charge.
电势可比作每单位电荷的位能。
Electric potential can be thought of as potential energy per unit charge.
电势可比作每单位电荷的位能。
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