Mark is always diligent in his studies because he firmly believes that hard work _______________.
马克是勤奋学习，因为他坚信努力 是成功的基础。
Our designers and marketing staff are always diligent in understanding customers, and customers stand in the position to establish a professional and reasonable implementation plan.
我们的设计师与营销人员总是勤于了解客户，并站在客户的立场去制订专业和合理的实施方案。
He is diligent and always keeps his house clean and tidy.
他这个人手勤，屋子收拾得非常干净。
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