聊得很开心，保重！

I had a great chat, ___t.c.!

我们每半小时进行一次进度检查以跟踪进展。

We do a ___T.C. every half hour to keep track of the progress.

实验室的样本需要在特定的温度控制下保存。

The lab samples need to be stored under precise ___temperature-controlled conditions.