Smiling almost always leaves a positive (积极的) impression on people, especially those who do not know you.
微笑几乎总是给人留下积极的印象，特别是那些不认识你的人。
We do not know whether this story is true or not, but it tells us that rice has the similar value as gold to the Chinese.
我们不知道这个故事是否真实，但它告诉我们，大米对中国人来说和黄金一样有价值。
Pale from fright, Heidi said, "I do not know."
海蒂吓得脸色苍白，说：“我不知道。”
"That is all very well," said he, "but still I do not know what it is to shudder!"
“这很好，”他说，“但我还是不知道害怕是怎么回事！”
Scientists do not know how much and what kinds of noises are harmful to ocean animals.
科学家们不知道有多少噪音以及何种噪音对海洋动物有害。
I do not know where else to take her, as she is too young to come with me to Frankfurt.
我不知道还能带她去哪里，因为她太小了，不能和我一起去法兰克福。
If people do not know how much they are eating, it can be really hard for them to stick to a diet.
如果人们不知道自己吃了多少，他们就很难坚持节食。
When students graduate from college, many of them do not know how they want to spend their working lives.
大学毕业后，许多学生不知道如何度过他们的工作生涯。
If the voters do not know how to use a computer, how do you expect them to finish the voting process through computers?
如果选民不知道如何使用电脑，你怎能期望他们通过电脑完成投票过程？
Potato chips are an American invention, but most Chinese, for instance, do not know than Frito-Lay is an American company.
薯片是美国人的发明，但比如说大多数中国人，不知道菲多利是一家美国公司。
For what this separation is done, I do not know, unless it be to hinder the development of the child's affection towards its mother.
除了妨碍孩子对母亲感情的发展，我不知道这种分离还会造成什么后果。
Moreover, there are processes that influence climate, such as modifications in land use, that scientists do not know how to simulate.
此外，还有一些影响气候的过程，如科学家们不知道如何模拟的土地利用的变化。
This means that you can possibly be friendlier to people you do not know and be more creative and able to solve problems more quickly.
这意味着你可以对你不认识的人更友好，更有创造力，能够更快地解决问题。
Only 6.1 percent of users have ever appealed to supervisory departments and about half of them do not know how to cancel unwanted SMS subscriptions.
仅有6.1%的手机用户曾向监管部门提出申诉，其中约一半人不知道如何取消不想要的短信订阅服务。
Scientists do not know what causes acrylamide to form but they believe it occurs as a result of a chemical process during baking, frying, or grilling.
科学家并不知道是什么导致丙烯酰胺的形成，但是他们相信它是在烘焙、油煎、烧烤或烘烤过程中产生的一种化学物质。
We do not even know, for example, how many stars have planets, and we certainly do not know how likely it is that life will arise naturally, given the right conditions.
例如，我们甚至不知道有多少恒星有行星，我们当然也不知道如果有适当的条件，生命自然出现的可能性有多大。
If families do not know English or have limited English skills themselves, how can they communicate in English?
如果一个家庭自己不懂英语或者英语能力有限，又怎么能用英语交流呢？
There is an increasing demand for people who are able to take in great area at a glance, people who perhaps do not know too much about any one field.
现在对那些一眼就能看懂大领域的人的需求越来越大，这些人可能对任何一个领域都不太了解。
If we do not know the facts, we are in no position to handle such matter.
不了解情况，就无从解决这类问题。
If there are things we do not know, it is because we haven't learnt them.
有所不知，盖未学也。
We do not know what he looks like these days.
没人知道他这些天看起来如何。
I do not know what should be cared and what shouldn't!
我知道什么是该在乎的，什么是不该在乎的！
You do not know where he comes from and yet he opened my eyes.
你们竟然不知道他从哪里来，这真是奇怪。
We do not know when to plant, " says the farmer Julio Hermandez.
我们不知道什么时候该种地了。
We do not know when to plant, "says the farmer Julio Hermandez."
我们不知道什么时候该种地了。
We do not know if this partly reassuring picture will be maintained.
我们不知道这种部分的再发现象是否会持续。
We do not know how high food prices might go, nor how far they could fall.
我们不清楚食物的价格究竟会有多高，也不知道他们何时跌落。
We do not know what they eat or why they also live with a wax scale insect.
我们不知道丝蚁吃什么，也不知道为什么和白蜡虫生活在一起。
Scorpions glow under ultraviolet light, but scientists do not know why.
蝎子在紫外线的照射下能发光，但是至今科学家还没解开这个谜。
Scorpions glow under ultraviolet light, but scientists do not know why.
蝎子在紫外线的照射下能发光，但是至今科学家还没解开这个谜。
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