tense up

Tense up the muscles in both of your legs.

把两腿的肌肉绷紧。

Another great relaxationtechnique is to tense up and then relax each musclein your body, one at a time, starting from your toes up to your head.

另一个放松技巧是让你身体的每块肌肉依次先收缩后放松。从脚趾开始往上，至头部结束。

Work swiftly, but don't tense up; relax your body and mind and never tighten up.

工作要赶不要急, 身心要松不要紧.

When we are under stress our bodies tend to tense up.

人一紧张，身体就会变僵硬。

If you tense up, you can snap just like a dry branch.

如果你太紧张的话, 你就会象干树枝一样断掉.

You mean it got tense when I showed up.

你的意思是,当我出现时,才变得紧张.

She could feel herself tense up as he touched her arm.

他碰她胳膊时,她感觉自己紧张得不得了.

I tried not to tense up, or become obviously wary.

我尽量不让自己紧张，或者表现得非常警觉。

We use the past perfect continuous tense to show that an action started in the past and continued up until another time in the past.

我们用过去完成进行时态来形容一个在过去开始的行动，这个行动持续到过去的另一个时间。