1.在复合句中作连接词，表示“只要；一……就……”，如： I will write to you as long as I arrive in Beijing.

　　2. 形容词long的同级比较用法，表示“和……一样长”。如：the blue pencil is as long as the red one.

　　只要，和。。一样长

　　这个短语放在不同的语境 有不同的意思

　　You may stay as long as you please.

　　你愿意呆多久就呆多久。

　　As long as I can trip around the world.

　　但愿我能周游世界

　　1.只要, 如果

　　I'll stay in mexico as long as my money holds on.

　　只要我的钱还能维持一天, 我就在墨西哥待一天。

　　I'll never forget that as long as I am living.

　　这事我至死也不会忘记。

　　2.既然, 由于

　　You may stay here as long as you like.

　　你高兴在这儿待多久就待多久。

　　as long as

　　conj.

　　During the time that:

　　I'll stay as long as you need me.

　　Since:

　　As long as you've offered, I accept.

　　On the condition that:

　　I will cooperate as long as I am notified on time.

　　只要，

　　在。。。。。的时候

　　假设，如果，只要，等

　　例如：You may go out and play, as long as you promise to be back in one hour.

　　你可以出去玩，只要你答应一个小时后回来。

　　“只要”的意思。

　　比如：As long as you love me. 只要你爱着我。

　　只要

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