expand on
柯林斯词典
1. PHRASAL VERB If you expand on or expand upon something, you give more information or details about it when you write or talk about it. 更充分講述; 進一步論述
The president used today's speech to expand on remarks he made last month. 縂統利用今天的縯講進一步闡述了他上個月的講話內容。
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