You'd better come clean.

　　你最好坦白交待。

　　come clean 直译过来就是：“变干净”，所以这个短语的正确意思是：“全盘招供，坦白交待，和盘托出”。因此，当美国人说"You'd better come clean."时，他/她要表达的意思就是:"You'd better tell the truth."、"You'd better not tell lies."、"You'd better be frank."。

　　情景对白：

　　Colleague: The personnel manager doubts about my forged degree. What should I do?

　　同事：人事经理怀疑我的假学历，怎么办？

　　Benjamin: You'd better come clean. Maybe he will keep you in view of your good performance.

　　本杰明：你最好坦白交待，或许他考虑到你的表现很好而留下你。

　　搭配句积累：

　　①I've involuntarily accepted a large amount of rebate from a company.

　　我身不由己，从一家公司收受了一大笔回扣。

　　②I have lost an important document. What shall I do?

　　我弄丢了一份重要的文件，怎么办啊？

　　③I broke our manager's favorite potting. Should I tell him?

　　我打碎了经理钟爱的盆栽。我应该告诉他吗？

　　④I'm afraid that the boss might have known my mistake.

　　恐怕老板已经知道我的过失了。

　　单词：

　　involuntarily adv. 身不由己地

　　Another surge of pain in my ankle caused me to give an involuntary shudder.

　　脚踝突然又一阵疼痛，痛得我直打哆嗦。

　　I shivered involuntarily with an inexplicable dread.

　　我怀着莫名其妙的恐惧，身不由己地不寒而栗。

　　Love is not to say that and should not, sometimes involuntarily pay nothing.

　　爱,也不是说该与不该,有时是身不由己的付出罢了。