I am very sorry to have you cool your heels for so long.

不得不让你等了这么久，真抱歉。

youdao

The total run can vary depending on how long a warm up and cool down you do. Remember, it is designed to be a continuous run with faster and slower paces, so don't stop during this speed training run.

记住，法特莱克是一种具有快配速和慢配速的连续跑，因此，在这个速度训练跑过程中，请您别停下来。

youdao

As a result, I want to appear cool and unconcerned with the incident, so I said, How long have you been following me? in the most casual and conversational tone I could manage.

所以我想装出一副冷漠的、对这一事件满不在乎的样子。 于是我尽量用一种漫不经心的极其随便的腔调说，“你们跟踪我多久啦?。

youdao