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。
Now, I was never sure why they needed to say who switched off the seat belt sign, but for some reason they always do.
—我从不知道为什么他们需要说是谁关闭了安全带信号，但是出于某种原因他们总是这样讲。
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。
A man with a watch knows what time it is. A man with two watches is never sure.
带一块手表可以叫人知道（准确）时间，然带两块手表却使人无法知晓。
I'm never sure if I'm getting the best price, most of the time I get all tongue-tied when I start haggling.
我总也不知道是不是买到了好价钱，大部分时间都是刚一开口侃价舌头就不听使唤了。
Im never sure if im getting the best price, and most of the time I get all tongue-tied when I start haggling.
我总也不知道是不是买到了好价钱，大部分时间都是刚一开口侃价舌头就不听使唤了。
I'm never sure if I'm getting the best price, and most of the time I get all tongue-tied when I start haggling.
我总也不知道是不是买到了好价钱，大部分时间都是刚一开口侃价舌头就不听使唤了。
There's an old joke that says "a man with one watch always knows what time it is; a man with two watches is never sure."
有一个流传已久的笑话：“佩戴一只手表的人常常知道时间，而佩戴两只手表后反而难以确定了”。
Psychologists know you have to be careful when you go poking around the human mind because you're never sure what you'll find there.
心理学家认为，当你触及他人思想的时候必须格外小心，因为你永远也无法肯定你将会发现些什么。
If you aren't an expert going into the cinema, you're never sure how much of what you see on screen actually happened in real life.
如果你并不是一个专家而去看电影，看下来你也不能肯定电影里有多少是真实发生的。
On those cloudy days, Robert Neville was never sure when sunset came, and sometimes they were in the streets before he could get back.
在阴天，罗伯特·奈维尔判断日落的时间就不准了。有时在他赶回家之前，天就黑了。
On those cloudy days, Robert Neville was never sure when sunset came, and sometimes they were in the streets before he could get back.
在阴天，罗伯特·奈维尔判断日落的时间就不准了。有时在他赶回家之前，天就黑了。
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