n.[C]

1. 信號；暗號[+to-v][+that]
   A red lamp is used as a danger signal.

   紅燈用作危險信號。

2. 信號器；交通指示燈；【鐵】信號機
   The train must stop when the signal's red.

   信號機是紅色時，火車必須停駛。

3. 導因；近因；導火線[（+for）]
4. 標誌；表示

a.

1. 作為信號的[B]
2. 顯著的，非凡的
   This year has seen one signal triumph for them in the election.

   今年是他們在選舉中取得重大勝利的一年。

vt.

1. 用信號發出；標誌
   A period signals the end of a sentence.

   句號表示一個句子結束了。

2. 用信號通知，以動作向……示意[O2][+that]
   She signaled the car to stop by raising her hand.

   她舉手示意車停下。

vi.

1. 發信號，打信號[（+to/for）]
   The teacher signaled for quiet.

   教師示意大家安靜。

n.

1. a gesture, action, or sound conveying information or an instruction.
2. an indication of a state of affairs.
3. an event or statement that provides the impulse or occasion for something to happen.
4. a light or semaphore on a railway, giving indications to train drivers of whether or not to proceed.
5. Bridge  a prearranged convention of bidding or play intended to convey information to one's partner.
6. an electrical impulse or radio wave transmitted or received.

v.

1. transmit a signal.
2. instruct or indicate by means of a signal.

adj.

[名]

1. ①信號。
   시그널을 빈번히 보내다.

   頻繁發送信號。

2. ②信號機。