Endiometer
气体容量分析管
🗣️ 情景例句
often took us somewhere in the city on the weekends.
经常在周末带我们去城市的一些地方。
I do not know whether you realize it, but this condition is essential to us.
我不知道你是否了解，但是，这个条件对我们是必要的。
The conference was very well organized. Everything began and finished on time.
会议安排的很好。开始和结束都准时。