When we know two vectors in a plane, it let us find the normal vector to the plane, and that is what we need to find the equation.
当我们已知平面上的两个向量，我们就可以找到，这个平面的法向量，然后我们就可以用法向量来找到方程。
Often life is a teacher; it let us understand: What is love? What is true happiness? Perhaps everyone's understanding is not the same!
很多时候生活就是一位老师；它让我们领悟：什么是爱?什么是真正的幸福?或许每个人的领悟都不一样！
They might refuse to let us do it, but it's hardly likely.
他们也许会不让我们做这工作，但这可能性太小。
Why don't they cut out the middleman and let us do it ourselves?
他们为什么不取消中间商，让我们自己来做呢？
"The thing is, you must understand it," said the narrator, "let us ask old Nanny."
“最重要的是你必须理解它，”讲这段故事的人说，“让我们问问接骨木树妈妈吧。”
Now, let us talk about packing it.
那现在我们谈谈它的包装吧。
"Don't let us make it tidy," said Mary anxiously.
“我们别把它弄得太整洁了。”玛丽焦急地说。
If we value something not as a means to something else, but for its own sake, let us say that it has "intrinsic value".
如果我们重视某物不是因为把它看作达成其他目标的手段，而是因为它本身，我们就说它有“内在价值”。
It will let us eliminate the risk we would take of contaminating the samples if they were brought back to Earth.
如果他们被带回地球，会使我们消除可能为样品污染而承担的风险。
Let us pretend that it is the end.
我们假装这就是结局吧。
It will be dark in fifteen minutes—and then let them follow us if they want to.
十五分钟后就天黑了——如果他们愿意，就让他们跟着我们吧。
Of course, it was an element the periodic table let us to expect existed before anyone had found it or made it.
当然，它在被人发现或制造前，就是一种元素周期表使得我们期待其存在的元素。
In this case, having to then let go of the book after holding it might generate a subtle sense of loss, and motivate us to make the purchase even more.
在这种情况下，拿着书后不得不放手，可能会产生一种微妙的失落感，并促使我们购买更多。
"With all my heart," said Partlet, "let us go and make a holiday of it together."
“全心全意地，”帕特莱特说，“走吧，让我们一起去度假。”
"That is queer, indeed," said the other, "let us follow the cart, and see where it goes."
“这真奇怪。”另一个说，“咱们跟着车子走，看看它要去哪儿。”
My chemistry teacher Mrs. Louise usually gave us the instruction paper the night before the lab class and let us read it.
我的化学老师路易丝夫人通常在实验课的前一天晚上给我们说明书，让我们阅读。
When they were free from work, they invited us to local events and let us know of an interesting competition to watch, together with the story behind it.
他们下班后，邀请我们参加当地活动，让我们了解一个有趣的比赛及其背后的故事。
让我们再净化它。
Who occupied this house before it was let to us?
这所房屋租给我们以前是谁住的？
It has rained itself out. Let us continue our match.
雨停了。让我们继续进行比赛。
And we have to be aware of that, and not let it control us.
我们必须意识到这一点，而不是让它控制我们。
I hope you enjoy this issue. If you like it, let us know. If not, well, let us know that, too. How else will we learn?
我希望你能喜欢这本杂志。若你喜欢，让我们知道。若你不喜欢，也让我们知道。我们或许还能学到一些什么。
If anyone knows if it is available, please let us know.
如果有人知道它是不是已经公布的话，请知会我们。
If anyone knows if it is available, please let us know.
如果有人知道它是不是已经公布的话，请知会我们。
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