Time past cannot be called back again.
时间不能倒流。
Time tries all.
路遥知马力，日久见人心。
Tit for tat is fair play.
人不犯我，我不犯人；人若犯我，我必犯人。
To err is human.
人非圣贤，孰能无过。
To know everything is to know nothing.
什么都知道，一如什么都不知道。
To know oneself is true progress.
人贵有自知之明。
Tomorrow never comes.
我生待明日，万事成蹉跎。
Too much familiarity breeds contempt.
过分熟悉会使人互不服气。
Too much knowledge makes the head bald.
学问太多催人老。
Too much liberty spills all.
自由放任，一事无成。
Too much praise is a burden.
过多夸奖，反成负担。
To save time is to lengthen life.
节约时间就是延长生命。
Touch pitch, and you will be defiled.
常在河边走，哪有不湿鞋。
Troubles never come singly.
福无双至，祸不单行。
Truth never grows old.
真理永存。
Turn over a new leaf.
洗心革面，改过自新。
Two dogs strive for a bone, and a third runs away with it.
鹬蚌相争，渔翁得利。
Two heads are better than one.
一个好汉三个帮。
Two of a trade seldom agree.
同行是冤家。
Two wrongs do not make a right.
别人错了，不等于你对了。
Unity is strength.
团结就是力量。
Unpleasant advice is a good medicine.
忠言逆耳利于行。