earlier
If you have worked hard earlier, you won't have to sit up all night before the exams.
如果你早点努力学习，就不用考试前整宿熬夜了。（虚拟语气的句子）
5. useless, efficient
They did a lot of useless work but refused to take any efficient pay.
他们做了很多无用功，但是拒绝接受任何有效的付出。
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