第四个浪潮，也就是最后一个，同时是正在进行的破坏浪潮，起源于现代，伴随着推土机和化学喷雾器的出现。
The fourth, last and ongoing wave of destruction dates from modern times, with the rise of the bulldozer and the chemical sprayer.
所述的滑塞轴与化学能自动喷雾器外盖上的带手把的止动块以凸轮方式活动连接。
The spool shaft is in flexible connection with a stopper which has a handgrip on the external cover of the chemical energy automatic sprayer.
所述的滑塞轴与化学能自动喷雾器外盖上的带手把的止动块以凸轮方式活动连接。
The spool shaft is in flexible connection with a stopper which has a handgrip on the external cover of the chemical energy automatic sprayer.
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