要是想在八月份去旅行，我建议及早购票。

I'd advise buying your tickets well in advance if you want to travel in August.

《牛津词典》

那么，每天喝八杯水这样的标准建议从何而来呢？

So where does the standard advice of drinking eight glasses each day come from?

youdao

尽管许多医生让患者每天喝八杯水，但是没有科学证据支持这个建议。

Although many doctors tell patients to drink eight glasses of water a day, there is no scientific evidence to support this advice.

youdao

And also I wanted to mention in terms of checking your Lewis structures, regardless of what they are, you should always go back and I had 10, and then count 2, 4, 6, 8, 10, because you always need to make sure you have the same number of valence electrons that you calculated in your actual structure.

我还想提一点关于检查,你的路易斯结构的建议，不管它们是什么，你总是应该回去检查一下,我有十个，然后数一数，二，四，六，八，十个，因为你总是需要确保实际价电子的数量,与你在结构中算出的数量相等。

麻省理工公开课 - 化学原理课程节选