只是别把它弄脏了，而且一定要言行检点。

Only don't stain it, and do behave nicely.

youdao

学会和你的同事进行有效率的交谈，而且一定要诚实清楚。

Learn to communicate effectively with your colleagues and always be honest and clear.

youdao

而且一定要是新钱，红包的钱数要是一个特定的数字。

The money must be in new bills, and the total amount must be an even number.

youdao

They had to get that all worked out, it had to be done accurately, and they had to decide to keep a certain amount of co-insurance.

他们得鉴定所有的东西，还得认真准确，而且他们还得决定是否,要进行一定程度的共保。

耶鲁公开课 - 金融市场课程节选

But he also realized that when they did hit something what they hit what unbelievably massive but also that that mass was concentrated So eventually, this is what we have come to call the nucleus of an atom.

碰到的一定是十分重的东西,而且那些质量,要聚集在非常非常小的空间内,这个就是我们称作,原子核的东西。

麻省理工公开课 - 化学原理课程节选