...ct, such as a statute, which has retrospective effect) 主动的,自愿的 ex proprio motu(ex mero motu): of his own motion 不可抗力 force majueure(法语): irresistible compulsion or coercion ..
双语例句
1
He studied navigation ofhisownmotion.
他是自愿学航海的。
2
But Frank married Lillian when he was 36, after he had done much ofhis time-and-motion work and years after he had set up his own engineering consulting business.