答:羽扇豆要煮七遍,不拣出来便坏了,故拣它反算作从食物里挑杂质。
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因为那豆是要煮七遍的。
as they are boiled seven times.
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他若不把它从壳里取出来,那豆便坏了。
And, if one does not remove them from the shells, they rot.
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既然如此,那便算作把杂质从食物里除去。
Therefore, it is considered like removing waste from food.
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羽扇豆可吃的那一部分一坏,壳也就发臭。
The rotting edible portion of the lupine causes the shell to reek.
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既然如此,把可吃的那一部分取出来,在律上便算作把杂质除去。
Removing the edible portion, therefore, has the legal status of removing waste.