sign: [ sain ]
n. 符号,正负号,手势,迹象,招牌
v. 签，做手势，做标记
词形变化:
名词:signer 动词过去式:signed 过去分词:signed 现在分词:signing 第三人称单数:signs
例句与用法:
1. Dark clouds are a sign of rain or snow.
乌云是雨或雪将至的预兆。
2. The football team has signed two new players.
该足球队已签约聘用了两名新队员。
3. She signed her name to the document.
她在文件上签了名。
4. Arsenal have just signed a new striker.
阿塞纳尔队刚雇用了一名新前锋。
5. Just sign on the dotted line and the car is yours.
你只需签署这份文件，这辆汽车就是你的了。
英英解释:
名词sign:
1. a perceptible indication of something not immediately apparent (as a visible clue that something has happened)
同义词：mark
2. a public display of a (usually written) message
3. any communication that encodes a message
同义词：signal, signaling
4. structure displaying a board on which advertisements can be posted
同义词：signboard
5. (astrology) one of 12 equal areas into which the zodiac is divided
同义词：sign of the zodiac, star sign, mansion, house, planetary house
6. (medicine) any objective evidence of the presence of a disorder or disease
7. having an indicated pole (as the distinction between positive and negative electric charges)
同义词：polarity
8. an event that is experienced as indicating important things to come
同义词：augury, foretoken, preindication
9. a gesture that is part of a sign language
10. a fundamental linguistic unit linking a signifier to that which is signified--de Saussure
11. a character indicating a relation between quantities
动词sign:
1. mark with one's signature; write one's name (on)
同义词：subscribe
2. approve and express assent, responsibility, or obligation
同义词：ratify
3. be engaged by a written agreement
4. engage by written agreement
同义词：contract, sign on, sign up
5. communicate silently and non-verbally by signals or signs
同义词：signal, signalize, signalise
6. place signs, as along a road
7. communicate in sign language
8. make the sign of the cross over someone in order to call on God for protection; consecrate
同义词：bless
形容词sign:
1. used of the language of the deaf
同义词：gestural, signed, sign-language