亲爱的朋友们，因为我的电脑没有中文输入软件，因此无法写汉字，请非常理解。

Dear friends, Because my computer has not input the Chinese character the software, therefore is unable to write the Chinese character, please very much understand.

youdao

And the final point I want to make today, and this is very, very important, so make sure that you do understand this.

而今天我要强调的最后一点，也是非常，非常重要的一点，因此请务必真正理解它。

麻省理工公开课 - 化学原理课程节选