十月芥菜

十月芥菜”形容少男少女情窦初开。
十月是荠菜开花结果之时，花蕊一般高，很整齐，土语花蕊又叫花心，故有此一说。

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I guess October is the month that causes a lot of problem, eh? Good news is, the rest of 11 months are not supposed to be as such :P