老板让他的工人们辛辛苦苦地工作。
所有参与销售会议的人，已经辛辛苦苦地工作了几个星期。
Everyone connected with the sales convention has been working very hard for several weeks.
他们真正需要的是：你愿意辛辛苦苦、开开心心、无限期地从事同一份工作。
What they really want: your willingness to toil away at the same job happily and indefinitely.
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