We should run all undertakings industrially and thriftily.

我们要勤俭办一切事业。

The principle of diligence and frugality applies to all undertakings.

勤俭节约的原则适用于一切事业。

These joint undertakings are like, you might think of them analogous to playing chamber music with a string quartet.

这些共同行为就像，你可以把它们想象成弦乐四重奏演奏的室内乐。

I can give you no undertakings.

我不能给你任何保证。

They are your personal undertakings.

这些都是要你个人承受的事。