impactor什么意思？

The most economical mechanism for tight shutoff is the impactor handwheel.要做到紧密关闭,最经济的机械装置就是冲击式手轮.The impactor is estimated to be the size of several football fields.估计造成撞击的小天体大概有数个足球场大.Grimlock and Impactor meet Megatro...

impactor的音标：impactor的英式发音音标为：['ɪmpæktə]impactor的美式发音音标为：['ɪmpæktə]...