【lessen】lessen和reduce的区别能不能造两个句子来看看

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【答案】 The heat will lessen during the evening.
　　晚上热气会减弱.
　　The talk lessened the tension.
　　这次交谈缓和紧张局面.
　　He is trying to reduce expenses.
　　他正试图减少开支.
　　He is trying to reduce the speed of the car.
　　他正试图减速.
　　reduce
　　减少;缩小;降低
　　lessen
　　变小,变少;减轻
　　两者区别在于,reduce是比较主动的缩减,而lessen是客观点的外在变化