他在地铁上遗失了装有合同原件的公文包,急得整夜没睡。Tā zài dìtiě shàng yíshī le zhuāng yǒu hétong yuánjiàn de gōngwénbāo, jí de zhěng yè méi shuì.He lost the briefcase containing the original contract on the underground and was so anxious that he did not sleep all night.
出门旅行时请保管好证件,以免遗失。Chūmén lǚxíng shí qǐng bǎoguǎn hǎo zhèngjiàn, yǐmiǎn yíshī.When travelling, please keep your documents safe so you don't lose them.
她在图书馆遗失了钥匙,只好向管理员求助。Tā zài túshūguǎn yíshī le yàoshi, zhǐhǎo xiàng guǎnlǐyuán qiúzhù.She lost her keys at the library and had to ask the librarian for help.