We must never be unworthy of our teachers'untiring and sincere teachings.

我们决不要辜负老师的谆谆教导.

《现代汉英综合大词典》

When we make the mistake, the teacher earnestlies instruct us.

当我们犯错误的时候, 老师就谆谆教导我们.

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He beat in me the duties of loyalty and filial piety.

他谆谆教导我要尽孝顺之道.

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Accept my sincere thanks for your kind instruction , which has left a lasting impression on me.

对您的谆谆教导, 我深表谢意,铭记不忘.

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