He does complicated math-sy and science-y stuff every day so when I whip out my phone calculator to figure out the tip, he's already done paying.

他每天都会做复杂的数学以及科学运算所以每当我拿起手机用计算器算饭钱的时候，他已经把钱付了（作者，你确定你不是因为不想买单吗）。

youdao

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