the crack of a whip的意思|示意

His voice still held a remnant of its wonted cool drawl but beneath the words she could feel violence fighting its way to the surface violence as cruel as the crack of a whip.

他的声音仍然保持着一点像往常那样冷静而缓慢的调子，但是她能感觉到里面尽力压抑着的那股凶暴劲儿，那股像抽响的鞭子一样残忍的劲儿。

I felt we weren't given a fair crack of the whip.

我觉得我们没有得到合理的机会。

Such fly-bys give spacecraft a whip-crack of extra speed【3】 on their tour through the solar system.

在太阳系中漫游的宇宙飞船当其靠近地球作低空飞越时，会加上一个额外速度。