in the course of = during

giữa lúc, đang lúc

Example:
In the course of our conversation, the lights went out.
Giữa lúc chúng tôi đang nói chuyện, đèn phụt tắt.

How to Master Most Common Constructions with Preposition
Giáo sư Lê Tôn Hiến

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