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（性格上的）倾向；习性
A propensity to do something or a propensity for something is a natural tendency that you have to behave in a particular way.
例句
Mr Bint has a propensity to put off decisions to the last minute...
宾特先生习惯拖到最后时刻才作决定。
She hasn't reckoned on his propensity for violence.
她不曾料到他有暴力倾向。