an artificial substance that has a similar taste to sugar, or a small pill made of this

something that you give to someone in order to persuade him or her to do something

The tax bill includes sweeteners for both parties, so it looks likely to pass. 税收法案对两党都有笼络条款，因此很可能得到通过。

a present or money given to persuade someone to do something, especially in a way that is secret and often dishonest

a financial sweetener 经济贿赂