This method tells you all information you need to know: whether one node is descendant of an ancestor of the other, whether it is before or after, and so on.
这个方法告诉您所有想知道的信息：一个节点是否是另一个节点的祖先的后代，它是在前面还是后面呢，等等。
When you create a variable, you need to declare what type it is before you can use it.
在创建变量时，需要声明变量的类型，然后才能使用该变量。
Listen I misplaced the 240 million dollar lottery ticket.You have to tell me where it is before my wife comes home, I asked.
听着，我不知把那张中了两亿四千万的彩票放哪了，你要在我妻子回到家前告诉我它在哪里。
If you read a number from a file and expect it to be positive, check that it is before further processing with that number.
如果从文件中读入一个数字并期望其为正数，那么，在使用其进行进一步处理前对其先验证一下。
Listen I misplaced the 240 million dollar lottery ticket. You have to tell me where it is before my wife comes home, I asked.
听着，我不知把那张中了两亿四千万的彩票放哪了，你要在我妻子回到家前告诉我它在哪里。
This method tells you all you need to know: whether one node is a descendent or an ancestor of the other, whether it is before or after, and so on.
这个方法告诉您所有想知道的内容：一个节点是另一个节点的后代还是祖先、在前面还是后面等等。
It is important to get the coals white-hot before you start.
在开始之前把炭火烧旺很重要。
It is important to recognize jealousy and to nip it in the bud before it gets out of hand.
意识到嫉妒并在它发展到无法控制之前就把它消灭于萌芽状态，这一点至关重要。
There should be greater treatment of sewage before it is discharged.
污水排放前应该进行更充分的处理。
It is that crying I heard before.
这是我之前听到的哭声。
It is normal to feel nervous before an exam.
考试之前觉得紧张是正常的。
It is conceivable that before going hunting the hunters would draw or study pictures of animals and imagine a successful hunt.
可以想象，在狩猎之前，猎人会画出或研究动物的图片，并想象一次成功的狩猎。
Resisting automation is futile: it is as inevitable as industrialization was before it.
抵制自动化是徒劳的：它就像之前的工业化一样不可避免。
We will rebuild Notre Dame so it is even more beautiful than before.
我们将重建巴黎圣母院，使它比以前更美丽。
Now, unlike the harpsichord which came before it, the piano is a percussion instrument.
不像之前的羽管键琴，如今的钢琴是一种打击乐器。
It would be better if there were some way to see atmospheric water while it is still vaporing before raindrops form.
如果我们能找到一些能在雨滴形成以前的蒸汽状态下就观察到大气水方法，情况会变的好一些。
Firstly, food is often thrown away before it reaches customers because too much of it is produced.
首先，食物经常在到达顾客之前就被扔掉，因为生产的食物太多了。
It is significant that he changed his will only days before his death.
他在临终前几天修改遗嘱，这很能说明问题。
It is treated with acid before being analysed.
对它先用酸处理再进行分析。
An aeroplane has to reach a certain speed before there is enough lift to get it off the ground.
飞机得在达到一定的速度以后，才能有足够的提升力从地面起飞。
State aid is less bountiful than it was before.
国家援助没有从前那么多。
Even if the recovery is under way, it may be some time before the official number crunchers confirm it.
即便经济已经开始复苏，仍要过一段时间官方统计数字才能确认这一点。
It is best to treat the disease early before it takes a hold.
最好还是病向浅中医。
It's surely only a matter of time before he is found, isn't it?
找到他只是个时间问题，对不对？
It is advised that fans seeking autographs join the line before practice starts.
建议寻求亲笔签名的影迷们在活动开始前排好队。
It is easy for families to run out of money before the weekly giro arrives.
每周直接转账救济支票还未到钱便花光的情况许多家庭都容易出现。
I must finish it before school is over tomorrow.
我必须在明天放学前完成这项任务。
The paper, usually red, is folded before it is cut with scissors.
纸通常是红色的，先要折叠，然后用剪刀剪开。
It is not necessary to enroll before the course starts.
不需要在课程开始前注册。
It is clear now that it is a matter of time before the entire European coastline disappears under water.
现在很显然，整个欧洲海岸线消失在水下只是时间问题。
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