n.信号;红绿灯;
v.发信号;示意;
adj.重大的;
例句:
Did you signal before you turned right?
右转弯前你示意了吗?
When I give the signal , run!
我一发信号,你就跑!
(North Amercian English)All I get is a busy signal when I dial his number (= his phone is being used) .
我什么时候拨他的电话听到的都是忙音。