drop shutter

名词旧式快门

1. 旧式快门：drop shot 扣球 | drop shutter 旧式快门 | drop someone a line 留下便条

2. 快门;开关：滴油器 drop lubricator | 滴油器 drop oiler | 快门;开关 drop shutter

3. 快门：drop shop ==> 锻工车间 | drop shutter ==> 快门 | drop shutter test ==> 坠落试验