No one seems to know for sure what it was that everyone saw in the sky.
似乎没有人知道这是什么，每个人都看到天空中。
Sal: Hard to know for sure, but we believe in aloha 'aina: love of the land.
赛儿：确实很难讲，但是我们相信阿啰哈爱纳：对土地的热爱。
He went on to provide a few hypotheses, but said it's too early to know for sure.
他紧接着提出了几种假说，但是又说现在确定原因为时尚早。
Though it is hard to know for sure when these photos were taken, they were all released in the last seven days.
虽然当这组照片被公布时人们很难去判断它的真实性，但是在过去的七天里他们还是全都公之于众中。
There is no way to know for sure how well the last stimulus worked because we don’t know what would have happened without it.
没有确切衡量最后一次刺激计划成效的方法，因为我们不知道如果没有它的话会发生什么。
The only way to know for sure if chest pain is caused by heart disease is to be evaluated by a doctor and perform certain tests.
证实胸痛由心脏病引起的唯一确切途径就是通过医生诊断以及做相关检查。
He wants it acted upon, and the only way to know for sure if the whole plan was successful is when it is acted upon weeks or months later.
他还要对方按照这个意识去行动，而唯一确认整个计划是否成功的方法就是等它在数周或是数月以后产生效果。
The cause of that disaster has not been determined though, and it is impossible to know for sure whether the system could have prevented it.
尽管那次灾难的起因未有定论，并且也不可能确信系统是否能阻止灾难发生。
The hair in the stomach of the mountain lion he had killed matched the hair of the boy. The whole town was relieved to know for sure that the killer had been found .
这些猎人从大狮子胃里取出的毛发与男孩的头发相似，并告知整个镇子的人们确信已经找到了杀死大狮子的人。
In hindsight, it's hard to know for sure if the Turtles were like what Cavallo described or if they ultimately became like that as a result of their unique situation.
回头来看，很难肯定海龟们真的像卡瓦洛说的那样，或者是独特的环境真的让他们最终是那样的。
In any case, although it's impossible to know for sure, it seems likely that Neanderthals were sailors long before modern humans built their first sea faring vessels.
不论如何，尽管不能确定，但尼安得特人很可能在现代人造出第一艘船的很久之前，就已经航海出行了。
When they get to know me and to trust me, knowing for sure I'm not selling them something—there'll be more honest feedback from them.
当他们开始了解我、信任我，并确信我不是在卖什么东西给他们时，他们会给出更诚实的反馈。
This fear mechanism is critical to the survival of all animals, but no one can say for sure whether beasts other than humans know they're afraid.
这种恐惧机制对所有动物的生存都至关重要，但没有人能肯定人类以外的动物是否知道自己在恐惧。
If you know you're going to be out late, make sure you've got enough money for a taxi to get home again or arrange to stay with friends for the night.
如果你知道你会很晚才回家，确保你有足够的钱打车回家或者和朋友一起过夜。
One day, the cat's-meat-man said to him, "Why don't you stop being a doctor for people and become a doctor for animals instead? I'm sure that you know a lot about animals-more than most vets. You wrote a wonderful book about cats. I'd send all the people with sick dogs or cats to you."
一天，卖供猫食用的肉的商贩对他说：“你为什么不停止为人类看病，转而为动物看病呢？我相信你对动物的了解比大多数兽医还要多。你写了一本关于猫的好书。我会把所有带着生病的猫狗的人都送到你这里来。”
Otherwise, we can't be sure of propagation, and being able to know exactly what happens is essential for testing.
否则，无法保证实现传播，也不可能确切地了解哪些因素对于测试非常重要。
We don’t know for sure what’s under our earth’s crust but this theory completely forgets to mention where the magma that erupts from volcanoes comes from if the earth is hollow.
我们至今仍然不知道地壳之下是为何物，但是这个理论遗漏了一个问题：如果地球是空心的，那么火山喷发而出的那些岩浆来自何处？
We aren't exactly sure what they have in store for us, but we know that they plan to take us sightseeing in their hometown.
我们不太确定他们为我们准备了什么，但是我们知道他们计划带我们到他们的故乡观光。
Let me emphasize: This is the only time you will ever know for sure that disaster is about to strike!
我要强调一下：灾难的发生是不可预测的，但是灾难恢复测试时间是确定的。
One thing I know for sure is that happiness is connected to two key mood regulators that our brains produce - serotonin and noradrenaline.
有一点我是肯定的，快乐与由大脑产生的两把情感调节器的钥匙密切相关——血清素和去甲肾上腺素。
One thing I know for sure, to be good in my business I could simply meet the expectations of my passengers.
有一件事我深信不疑，想在这个行当中做得好，只要满足乘客的期望就行了。
While we may never know for sure if a machine is experiencing consciousness or only appears to, building such a machine would revolutionise our understanding of the brain.
在我们永远不确定是否一个机器正在体验知觉或者仅仅是看起来好像有知觉的情况下，建造这样一个机器将会彻底改变我们对大脑的理解。
We all desperately want to get it right and never know for sure whether we are.
我们都拼命的想做对的事却永远不确定我们做的到底对不对。
As I'm sure you know, Socrates was put on trial, condemned to death for corrupting the youth of Athens — and perhaps, among other things, for arguing philosophy with them.
想必你们都知道，苏格拉底被人指控，以教唆雅典青年的罪名，被判处死刑，也许，罪名还包括，和青年们讨论哲学。
Basically, we still don’t know for sure - but the important thing is to find out what you’ve got and what you like.
基本上我们也不是太确定---但是重要的是去发现你有什么和你喜欢什么方式。
Basically, we still don’t know for sure - but the important thing is to find out what you’ve got and what you like.
基本上我们也不是太确定---但是重要的是去发现你有什么和你喜欢什么方式。
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