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They work hard, but their efforts are not very productive. 他们很努力，但效率不太高。
They worked hard to provide for their large family. 他们努力工作以供养一大家子人。
They work hard for the sake of their company. 他们为公司努力工作。
They work hard from morning to night. 他们从早到晚努力工作。
They work hard to make our country rich and strong. 他们为使我们的国家富强而努力工作。
They work hard fore that they should fail. 他们努力的很,惟恐失败。
They work hard . They are happy monks . 他们努力工作。他们是愉快的和尚。
The final exam is difficult, but most of my students should be able to struggle through if they work hard. 期末考试很难，但是如果学习努力，大多数学生是可以设法通过的。
They work hard,but their efforts are not very productive. 他们很努力，但效率不太高。
They work hard all day long repairing and cleaning their nest. 他们整天艰苦劳动，修缮打扫他们的住房。
In order to lay a solid foundation they work hard at English. 为了打下坚实的基础,他们刻苦地学习英语。
Neither of them is in good health, but they work hard. 他们两人身体都不好,但他们工作很努力。
They worked hard to perfect their dance. 他们卖力地使舞蹈更加完美。
They work hard every day, and save a lot of people from disease. 他们每天都努力工作，并从疾病手中挽救了很多生命。
They worked hard to elevate the living standards. 他们努力工作以提高生活水平。
They worked hard for every detail. 他们为每个细节煞费苦心。
They worked hard, but got only board wages. 他们工作辛辛苦苦，但所得的报酬仅是膳宿而已。
Are they working hard this term? 这学期他们在努力学习吗?
Not only do they work hard, but they are also creative in their work. 他们不仅工作努力，而且在工作中也富有创造性。
Not only did they work hard ,but they were also creative in their work . 他们不但工作努力，而且在工作中富有创造性。