As they were waiting for their meal to arrive, he began doodling a crude picture of a casket on his paper napkin.
在等着饭菜被端上来的时候，他开始在他的餐巾纸上粗糙地画着一口棺材。
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This paper aims to explain the teaching of the dark casket designing experiment of electromagnetism that clarifies the course of the designing experiment.