1. 奖金；津贴
    A bonus is an extra amount of money that is added to someone's pay, usually because they have worked very hard.

    e.g. Workers in big firms receive a substantial part of their pay in the form of bonuses and overtime.
           大公司的员工有相当一部分薪酬来自奖金和加班费。
    e.g. ...a £15 bonus.
           15英镑的奖金

2. 额外的好处；意外收获
    A bonus is something good that you get in addition to something else, and which you would not usually expect.

    e.g. We felt we might finish third. Any better would be a bonus...
           我们感觉我们可能会获得第三名，要是能比这个名次更好那就是意外的惊喜了。
    e.g. It's made from natural ingredients, but with the added bonus of containing 30 per cent less fat than ordinary cheese.
           该干酪用天然原料制成，而且其脂肪含量比普通干酪低30%。

3. （保险公司付给投保人的）红利，余利
    A bonus is a sum of money that an insurance company pays to its policyholders, for example a percentage of the company's profits.

    e.g. These returns will not be enough to meet the payment of annual bonuses to policyholders.
           这些收益不够支付投保人每年分得的红利。