unless

conj.

除非，如果不；

prep.

除了，…除外；

unless and until直到…才

1. I won't go to the party unless I'm invited.
   除非我被邀请，否则我不会去参加晚会的。
2. I sleep with the window open unless its really cold.
   我总是开著窗户睡觉，除非天气非常冷才关上窗户。
3. Iron corrodes unless it is greased or kept clean.
   如果不涂油或保持清洁铁便会腐蚀。
4. Unless you work harder, you will not pass the examination.
   如果不加紧用功，你就不能通过考试。

1. Nothing could stop me from waiting for you to come back unless death.
   除了死亡再没有别的事物能够阻止我等待你回来。

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