They all look so alike to me that I'm never sure which is which.
它们在我看来简直一模一样，我永远分不清哪个是哪个。
I'm never sure what I'm going to be, from one minute to another!
我永远也不知道下一分钟自己会变成什么样子！
And the force caused by the magnetic field, I am never sure about the sign.
由磁场生成的力，我不确定其符号。
You're never sure whether he's serious or joking.
你总摸不透他是认真的还是开玩笑。
She was never sure if it was the right thing to do.
以前她并不知道出国留学是否正确。
He that waits upon fortune is never sure of a dinner.
空等好运来到，下一餐在哪儿都不知道。
He that waits upon fortune is never sure of a dinner.
空等好运来到，下一餐在哪儿都不知道。
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