我不想开先例。

I am unwilling to set a precedent.

《牛津词典》

如果允许他这样做，就会为别人开先例。

If he is allowed to do this, it will be a precedent for others.

《新英汉大辞典》

如果运气好有椰子，我们就砸开先喝椰汁，再吃里面的椰子肉。

If we had coconuts, we would break them open, drink the juice and eat the meat inside.

youdao

We'll start up a shell and we'll try it. All right, we'll just get out of what we were doing here.

我们开一个shell然后试试，先退出现在的这个来。

麻省理工公开课 - 计算机科学及编程导论课程节选

If you go to a savings bank, or a savings and loan, or a commercial bank and you say, I want to open up a checking account--that's a deposit; or, I want to open up a saving account--that's a deposit.

如果你去一个储蓄银行或者商业银行，去储蓄或者贷款，你说，我想开个支票账户，这就是储蓄;,或者说我先开个存款账户，这就是储蓄。

耶鲁公开课 - 金融市场课程节选