They paid a heavy price for that. They offered us a profound experience and lesson.

他们都付出了沉重的代价，提供了极其深刻的经验与教训。

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The lesson to be learned from the present case is that a transient plasma cell dyscrasia may present like multiple myeloma in the setting of heavy immunosuppression after organ transplantation.

从这个病例中得到的教训是，在器官移植后的严重免疫抑制状况下，暂时性血细胞恶液质可以有类似多发性骨髓瘤样的表现。

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To face the heavy task of teaching in the very short period of time, it is important to improve efficiency by using collective lesson preparing.

面对时间紧、任务重的课堂教学，通过集体备课提高教学效益显得尤为重要。

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However, although the sea ice is shrinking -- covering less total area as well as becoming thinner -- the Arctic is still a world ruled by ice, a lesson well learned when the Polar Pioneer encountered heavy pack ice between Svalbard and the eastern coast of Greenland, forcing the captain to divert the boat and drop speed to just a few knots.

BBC: Life in the fragile, frozen Arctic