A corporation can buy back its bonds by paying investors the face value (plus a sweetener).

公司可通过支付投资人债券票面价值（外加甜头）来买回自己的债券。

Buy back shares?

买回股票？

It would be illegal for them to buy back the shares.

他们要想买回股票是不可能的。

But it didn't keep its promise to buy back those tombs.

但是他并没有遵守承诺买回这些墓地。

He could make a big acquisition or buy back shares.

他可能会进行大额并购或者回购股票。