You're running some reaction. It's in the atmosphere. It's at constant pressure.

你已经在进行一些反应,在大气中，在恒温下。

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Let's say you have been a runner for some time and you have been running daily

假设你是个赛跑手，你每天都会跑步。

That's why 课堂 - SpeakingMax英语口语达人