sign
单词辨析：
指在文件、合同、签到簿等上签名，表示同意、批准或出席，或在作品上署名，表示是某人所作。
He signed his name on the paper/check.
他在文件/支票上签了字。
Both sides are ready to sign the contract.
双方准备签署合同。
The painting isn't signed so we don't know who it's by.
这幅画没有签名，不知道是谁画的。
指名人在书籍、照片等上签名。
The book is ready to be autographed by the writer.
已准备好书让作者在上面签名。
He's got a basketball autographed by the whole team.
他得到了一个有全体队员签名的篮球。
指在支票、票据等背面签名。
She has already endorsed the check.
她已在这支票背面签名。
The bill needs to be endorsed.
该票据需要背书。
指写下来或印在物体上的记号。
Make a mark at the margin.
在页边做个记号。
Why does this piece of silver bear his mark?
为什么这件银器上有他的印记？
指具有某种特殊含义的记号或形状。
￡ is the sign for the British pound.
￡是表示英镑的符号。
'+' is the plus sign.
“+”表示加号。
指表示声音、数量、化学物质等的字母、数字或记号。
These are the phonetic symbols.
这些都是语音符号。
What is the chemical symbol for iron?
铁的化学符号是哪个？
指某人、某物曾经出现或存在过的迹象。
The police found some traces of the robbers.
警方已经找到强盗的一些踪迹。
The killer disappeared without a trace.
杀手消失得无影无踪。
There was no trace of any drugs in his blood.
他的血液中未有毒品存在的任何迹象。
指帮助弄清事情缘由或帮助破案、解开谜团的线索。
At last she found a clue to the puzzle.
最后她找到了解开那个谜的头绪。
Are there any clues we can use to find the murderer?
有我们能用来找到凶手的线索吗？
We have no clue as to where she went after she left home.
我们对她离家后去往何处毫无线索。
指某事属实、即将发生或存在着的迹象。
Dark clouds are the sign of heavy rain.
乌云是大雨将至的预兆。
At the first sign of danger, the submarine will submerge.
一有危险迹象，潜艇就会潜入水中。
There was no sign of a roadblock.
那儿没有设置路障的迹象。
相关例句：
As soon as the seat belt sign had been switched off, we rushed out.
安全带指示灯一关掉，我们就冲了出去。
Once the decision is reached, he can date and sign the sheet
一旦决议达成，他就可以在这张纸上签署日期和姓名了。
The London train was on time, but there was no sign of my Finnish friend.
伦敦的火车准点到达，却不见我那芬兰朋友的踪影。
The priest made the sign of the cross over him.
神父在他上方画了个十字。
I had to sign on the dole on Monday.
我只好于星期一办理了领取失业救济金的登记。
Cutting school more than once in three months is a sign of trouble.
3个月内旷课次数超过一次就可能有麻烦了。