氧是一种能和许多物质化合的气体.Oxygen is a gas which unites with many substances.在有限自动机公开钥密码体制中首次提出了自动机化合的概念.The concept of composition of finite automata is first proposed in finite automaton public key cryptosystem....
His toupee dropped off, revealing his bald head.他的假发掉了，露出了光头。When he grew bald he bought a toupee.头发掉了后,他买了一顶假发.One more thing: While I was writing that last paragraph, the nurse straightened my toupee.还有件事: 我写最后一段的时候, 护...