signal
signal 作名词表示“信号”
a danger/warning/distress signal
危险、警告、遇难信号
TV signals
电视信号
I couldn't get a signal on my cell phone.
我的手机接收不到信号了。
作动词表示“发信号”
signal sb 对XX发信号；对XX示意
She signalled him to follow.
她示意他跟她走。
“手机没信号”其实还有不同的表达方式：
I thought you said you didn't get reception here.
你说过这里没信号的。
Well, maybe he can't get cell reception.
也许他手机没信号了。
Mike, can I borrow your phone? There's no signal on mine.
迈克，能借你手机用下吗？我的没信号。
I don't have any bars anywhere ever. My phone sucks.
我在哪边都没信号，破手机！
这里的bar就是手机上的信号格
I've been out of cell range for most of the day.
今天大多数时间我手机都没信号。
Oh, that's weird. I just lost cell reception.
真奇怪 我手机突然就没信号了。
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