词汇：topic
n. 题目；主题（等于theme）；一般规则；[逻]总论
相关场景
495. The academic topic is why the blade of the spade is still sharp after decades' decay.
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495.学术主题是为什么铁锹的刀刃经过几十年的腐烂仍然锋利。
On the topic of American Indians, Jackson spoke very candidly.
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