be sure to do

基本解释

Wherever you choose to study, be sure to do some research so that you can get the most out of your studying abroad adventure.
无论选择在什么地方留学，你都要仔细搜集相关资料，这样才能充分享受你的留学生活。
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Be sure to do your best to complete all open assignments and leave detailed progress reports for your supervisor and co-workers.
要确保尽自己最大的努力完成所有已开始的任务，并为你的主管和同事留下详尽的进度报告。
Negotiate and get it all in writing: If you plan on negotiating, be sure to do your research on the cost of living and have realistic numbers to back up your statements.
协商并以书面的形式记录下来：如果你打算和公司协商的话，要确保你做了在当地的生活费用调查以及有确凿的数据来证明你的陈述。

"He said Mister Clay seemed to be very weak and had a very bad cough, that he was sure Mister Clay wanted to do something for the good of his country during the little time he had left on Earth.
So again, we should be able to check all of our formal charges and make sure they add up to 0, which they do, and that makes sense, because we have a neutral atom in terms of thionyl chloride.
因此同样地，我们可以检验一下,我们所有的形式电荷是否正确,确保它们加起来等于零，而它们确实是这样，这是合理的，因为亚硫酰氯是一个中性原子。
麻省理工公开课 - 化学原理课程节选
And they want to be sure that before you get married, you can do things in the house.
他们想在结婚之前确认，你能做家务。
I'm good at 课堂 - SpeakingMax英语口语达人

On this count, select your managers very carefully and be sure to do your due diligence.
FORBES: Review: The Little Book of Bulls Eye Investing