be + expired
表示某物已过期失效。
The milk is expired.
牛奶过期了。
失效的；过期的
呼出的；死亡的
having come to an end or become void after passage of a period of time
失效的
that is no longer valid
呼出的
that has been breathed out
死亡的
dead
You cannot use this expired coupon at the store.
你不能在商店使用这张过期的优惠券。
用法提示：这里'expired'作形容词，修饰'coupon'，表示优惠券已超过有效期。
The milk smells sour because it has expired.
牛奶闻起来酸了，因为它已经过期。
用法提示：这里'expired'作形容词，在系表结构中描述牛奶的状态。
She renewed her expired passport before the trip.
她在旅行前更换了过期的护照。
用法提示：这里'expired'作形容词，修饰'passport'，表示护照已失效。
表示某物已过期失效。
The milk is expired.
牛奶过期了。
强调状态变化。
The coupon became expired last week.
优惠券上周过期了。
强调持续状态。
The license remains expired.
执照仍然过期。
grammar · medium
易错句子He is an expired doctor.
正确表达His license is expired.
expired 用于描述事物（如证件、食品）的状态，不用于描述人。应改为 His license is expired，表示证件过期。
grammar · medium
易错句子The expired date is tomorrow.
正确表达The expiration date is tomorrow.
expired 是形容词，意为过期的；expiration 是名词，意为到期、截止。修饰 date 应使用名词 expiration，构成固定搭配 expiration date（截止日期）。
expired强调被授权期限结束而失效，overdue强调超过预定期限尚未完成。
expired指法律、合同或食品等期限届满，outdated指观念、技术或设计陈旧。
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