“要不然”的英语？

把它扔进邮筒，要不然就让你的秘书发份传真。Pop it in the post, or get your secretary to fax it.除非我们到来，要不然那间小木屋一直都是空的。The log cabin stayed empty, except when we came.别出声，要不然我们都会被抓住的。Keep quiet or we'll all get nicked....