这些都没问题，但奥巴马上任才八个月。

That's all true. But Obama has been in office eight months.

youdao

途中，目标可能会改变，会需要不同的策略，这些都没问题，但如果完全没有目标，我们将一事无成。

The destination may change along the way requiring different tactics, and that is ok, but not having a destination at all is a ticket to nowhere.

youdao

It's OK to use certain fundamental constants that come in a lot of calculators, so there's nothing we can do about that. That's OK.

当然允许使用,一些普通计算器里都有的基本常数，我们不会连这些都不让用，这是没问题的。

麻省理工公开课 - 化学原理课程节选