vt.使顯著;使突出;特別指出;表明;使信號化
A red light is usually a signal of danger. 紅燈通常是危險的信號。
I stood watching for the signal to change to green. 我站著等待交通信號轉(zhuǎn)為綠燈。
Let's set the clock by the radio time signal. 咱們照著收音機的報時信號把鐘對一對。
A red lamp is often a danger signal. 紅燈常常是危險的信號。
A reflected signal on a communication channel. 一種在通信信道上反射回來的信號。