伸展把柄的英文：
tension grips

tension是什么意思：
n. 拉紧，绷紧；紧张；紧张局势；电压

Her nervous tension relaxed.
她紧张的神经松弛下来。

The air was surcharged with tension.
空气中充满了紧张的气氛。

For several hours, tension mounted.
有几个小时，紧张局势有所加剧。

contact points and brushes tension gauge
触点及电刷电压计

The tension was so great that the rope broke.
绳子拉得太紧绷断了。

grips是什么意思：
n. 紧握；对…的影响力；理解；把手
v. 紧握；吸引注意力；对…产生强有力的影响

to have a sound grip of a problem
对问题有较深的理解

hand baggage grip
手提包

The country was gripped by a frenzy of nationalism.
这个国家笼罩在民族主义的狂热中。

Property's grip on people is unrelenting.
房产对人的控制是无情的。

John has a good grip of his subject.
约翰深刻了解他的学科。