英语语法分析

I noticed a woman on the factory floor putting nozzles onto rubber hoses.

我注意到一位女士在车间里正往塑料软管上装喷嘴。

First the machine takes off and hovers above the ground by firing downward-facing nozzles.

首先这种机器启动后加热朝下的喷嘴，会在地上盘旋。

Chevrons are the sawtooth pattern seen on the trailing edges of some jet engine nozzles.

Chevrons是见于某些喷气式发动机喷口后缘的锯齿状构型。