合同明确规定了使用年限和后续维护责任。Hétong míngquè guīdìng le shǐyòng niánxiàn hé hòuxù wéihù zérèn.The contract clearly specifies the service life and subsequent maintenance responsibilities.
这台机器的使用年限是十年。Zhè tái jīqì de shǐyòng niánxiàn shì shí nián.The service life of this machine is ten years.
学校规定了学习年限,最长不能超过六年。Xuéxiào guīdìng le xuéxí niánxiàn, zuì cháng bù néng chāoguò liù nián.The school sets a time limit for study, which cannot exceed six years at most.