It must be clear to every person, at all times, what she or he should do to make the most effective contribution to the business.
所有人都必须始终明白，她或他应如何做才能对业务做出最有效的贡献。
I'm not sure in the future days I will change my mind, but I'm sure that I must make a contribution to society, even if it is a cleaner.
我不敢肯定在今后的日子里我是否会改变主意，可是，我敢肯定的是，我一定要做个对社会有贡献的人，哪怕是一个清洁工人。
It must also be considered that entertainers do make a contribution to society because they amuse people and help them to relax and forget their troubles.
大家必须考虑到，演艺人员的工作对社会是有贡献的，因为他们给人们提供娱乐，帮助人们放松心情并忘却烦恼。
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