信号弹的英文：
signal rocket

参考例句：

They will fire off a signal flare.
他们将发射一发信号弹。

The distressed ship sent up a flare.
遇难的轮船发射了一枚信号弹。

As soon as you get to the assembly point send up a red flare.
你们一到达集合地点马上发射一颗红色的信号弹。

Guns were blazing, flares going up and the sky was lit up all around.
炮火不断，信号弹此起彼伏，四周的天空都被照亮了。

signal是什么意思：
n. 暗号；预兆；信号；导火线
v. 发信号；用信号通知，示意；标志

register signal
记录器信号

A servo potentiometer that generates the signal for comparison with the input signal
一种产生信号以便与输入信号进行比较的伺服电位计。

position command signal
位置指令信号

He read a flag signal.
他了解旗信号。

The submarine signaled for help.
潜水艇发出求救的信号。

rocket是什么意思：
n. 火箭
v. 飞快地移动；急速上升

The rocket boosts the astronaut into space.
这火箭能把太空旅行者送入太空。

The rockets flared a warning.
火箭发出闪光警告。

The secondary planet is send by rocket.
这颗卫星是由火箭发射的。

The second rocket has divorced itself from the first spent rocket
第二级火箭已经脱离已燃尽的第一级火箭。

Propellant is another term for the fuel of a rocket.
推进剂是火箭燃料的另一术语。