signal n. 信號 vi&vt發信號
signal +that- clause
signal sb to do sth 示意某人做某事
For example, I have learned to signal to my teammates in computer language to give me the ball when I am open and have a good shot for a goal.
例如，當我前面沒人防守，有機會射一個好球時，我已經學會了用計算機語言向隊友示意把球傳給我。
signal, sign, mark and symbol的用法
signal 「信號」，常用於傳達某些信息的信號，也指燈光，聲音或信號標誌。
sign「符號，標記」，表示「情緒，性格」的直觀顯示，還指具體的用於識別或指示的標誌，如指標牌，卡片等，此外還有「跡象、徵兆的意思」。
mark「斑點，記號」一般指用於辨別該物品的附屬物，同時也有分數的意思。
She signaled that it was time to leave.
她示意該走了。
She signaled me to follow her. 她示意我跟她走。
The rise in the housing price is a clear that the government should take some measure to control it.
房價的上升是一個清晰的信號，政府應該採取措施了。
The dove is a symbol of peace.鴿子是和平的象徵。
Can you tell me what the meaning of the traffic sign?
你能告訴我這個交通標誌的意思嗎？
習題
1 -All the grain was washed away.
-But there was no _____ that a heavy rain was coming last night.
A sign B. signal C. mark D. sight
A -所有的穀物都被衝走了。
--但是沒有跡象表明昨天晚上要下大雨。
2 Her latest novel ______ a turning point in her career as a writer.
A launches B marches C promotes D marks
D mark vt標誌著，表明
他最新的小說標誌著她作為作家生涯的轉折點。
3 The lion is considered to be the king of the forest as it is a _____ of courage and power.
A symbol B. signal C. mark D. sign
A
獅子被認為是森林之王，因為它被認為是勇氣和力量的象徵。
4 -Hello, Jessica!What happened?
--I could not hear you clearly because my mobile phone could not receive good _____.
A sign B. signal C. symbol D. mark
B
--你好，傑西卡，發生什麼事了？
---我不能很清晰地聽到你的聲音，因為我的收集不能接受清晰的信號了。
5 Be careful! A red light is usually a _____(信號) of danger.
小心，紅燈通常是危險的信號。Signal
6 There are _____ to show that a new , different city is coming out of its dark past.
A signals B. marks C .signs D symbols
C 有跡象表明一個新的 不同的城市正在產生於它的黑暗的過去。
7 In our class, when the bell rang and the teacher closed his book, it was a ____for everyone to stand up.
A signal B. chance C mark D measure
A 在課堂上，當鈴聲敲響，老師合上書的時候，就是我們要起立的時候。