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。
Well, I am no expert at that, but I think you can try lifting weights and do at least 200 sit-ups twice a day.
我不是这方面的专家，但我认为你可以试试每天举重和做至少200个仰卧起坐，每天进行两次。
You can keep it all year as long as no one else requests it, but someone else has, it looks like one of the professors in the sociology department.
只要没有其他人需要它，你可以借它一整年，但有人需要了，则可能会是社会学系的一位教授需要。
No one really knows how many different faces someone can recall, for example, but various estimates tend to hover in the thousands—based on the number of acquaintances a person might have.
例如，没人确切地知道一个人究竟能记住多少张不同的面孔，但是各类评估倾向于几千张上下——依据一个人可能相识的人数来判断。
There is plenty I can get to read and listen to, but for speaking, there really is no substitute for trying to speak and use the language in a relaxed atmosphere.
我能找到的阅读和听力资料很多。但是至于“说”，没有什么比能够让人放松地应用语言的环境更理想了。
I have tried to convey the strong feeling that I want to be black to the people around me, but no one can listen to it.
我曾试着去和身边人传达那种我想成为黑人的强烈感觉，但没人能听进去。
Not everyone wants a driverless car now—and no one can get one yet—but among those who are open to them, every age group is similarly engaged.
现在，并非人人都想拥有一辆无人驾驶小轿车，也没人能拥有，但各个年龄段都有愿意尝试无人驾驶小轿车的人。
The sandbox is time-boxed, but there is no limit to how much you can use it.
沙箱是有时间限制的，但是对于您使用它的程度却没有限制。
But it's also been emphasized that no major policy changes can be expected to come out of the meeting.
但是也强调，这次会议预期不会做出重大政策改变。
You can take notes, but there is no need to write down everything on the screen.
你们可以做笔记，但是没有必要把屏幕上所有的东西都记下来。
There are no dinosaurs alive today, but models of dinosaurs can be seen in the museum.
当今已经没有恐龙生存了，但是我们可以在博物馆看到恐龙模型。
We have no chance of competing against machines on frequent high-volume tasks, but there are things we can do that machines cannot.
在频繁的大批量任务上，我们没有机会与机器竞争。但有些事情我们可以做，而机器做不到。
It's no surprise that high-profile athletes can influence children's eating behaviors, but the scientists were able to quantify how prevalent these endorsements are in the children's environment.
高知名度的运动员可以影响儿童的饮食行为，这并不奇怪，但科学家能够量化这些代言在儿童环境中的流行程度。
Health experts say ingesting a small amount of melamine poses no danger, but in larger doses, it can cause kidney stones and lead to kidney failure.
健康专家表示，摄入小量三聚氰胺不会有危险，但如果摄入量很大，可导致肾结石，并会诱发肾衰竭。
One of the interesting things about London Bridge is that it's now no longer in London but in Arizona, and you can see a palm tree here.
一件关于伦敦桥的趣事是，它现在已经不在伦敦而在亚利桑那州，你们在这儿可以看见一棵棕榈树。
One funny observation about a problem in your life can be funny, but five is just complaining, no matter how smart you think you are.
对生活中对某个问题的观察可能很有趣，但第五个就是抱怨，不管你认为自己有多聪明。
They can no doubt create a lot with just those five colors, but you are right, maybe they can't mimic every color around them, so that's where the second kind of cell comes in.
毫无疑问，它们可以用这五种颜色创造出很多东西，但是你是对的，也许它们不能模仿它们周围的每一种颜色，所以这就是第二种细胞出现的地方。
There is no cure for either illness, but the flu can be prevented by the flu vaccine, which is, for most people, the best way to fight the flu.
两种疾病都无法治愈，但是可以通过流感疫苗预防流感。对于大多数人来说，这是对抗流感的最佳方法。
Microchips can not only work for a pet's whole life but help lost pets no matter how far they've been away from home.
微芯片不仅可以在宠物的一生中发挥作用，而且还可以帮助迷路的宠物，不管它们离家多远。
Studies show that for adults there is no danger, but children can develop loss of vision if they have glasses inappropriate for their eyes.
研究表明，这对成年人来说没有危险，但如果儿童戴了不适合他们眼睛的眼镜，可能会导致视力下降。
I shall send for you sometimes to help—but you must come when no one can see you.
我有时会叫你来帮忙——但你来的时候，千万不要被别人看见。
Taurus likes to plan life but Libra will make no such commitment and this can lead to some violent abuse on both sides.
金牛喜欢计划生活，而天秤不会做出这样的保证，这会导致双方出现一些剧烈的伤害。
But today, a disruption to family fortunes can no longer be made up with extra income from an otherwise-stay-at-home partner.
但如今，家庭财富的损失再也无法用家庭主夫或主妇的额外收入来弥补了。
A blind eye can no longer sense sight, but a bionic eye can use a camera to "see" the environment and send information to the mind.
眼睛失明后无法再次感知视觉，但仿生眼可以利用摄像头“看见”周围景象，之后给大脑发送信息。
You can go for long walks and swim in the rivers but there are no shops, cinemas or cafes.
你可以散步、在河里游泳，但这里没有商店、电影院或咖啡馆。
There is no central heating, but there's a wood-burner and solar panels on the top which can provide power for lighting, music, and computing.
它没有中央供暖系统，但有一个燃木炉，屋顶有太阳能电板，可以为照明、音乐和计算机提供电力。
The ticket had a strict no-transfer policy, but since passport information was not required when booking, any Canadian Elizabeth Gallagher can use it.
票有严格的不可转让的政策，但由于预订时不需要护照信息，加拿大任何叫伊丽莎白·加拉格尔的人都可以使用它。
There is no age limit at which you can open a bank account, but a bank manager can decide whether to open an account for a child or a young person.
在银行开户没有年龄限制，但银行经理可以决定是否给小孩或年轻人开户。
One day, you will wonder why you have no clean socks, and why some of your best friends can cook a delicious meal but you cannot!
将来某天，你会觉得奇怪：为什么你一双干净袜子都没有，为什么你最好的几个朋友可以做出一桌好菜，而你却不行！
Some doctors say that masks can stop the virus as much as 80%, but if you don't wash your hands often, it's no use wearing a mask.
医生称，口罩可以阻挡高达80%的病毒，但如果不勤洗手，戴口罩也没有用。
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