n.(男、女)内裤，(男用)衬裤

He forgot to put on his underpants this morning.
他今天早上忘了穿内裤。
The laundry basket is full of dirty underpants and socks.
脏衣篮里装满了脏内裤和袜子。
She always buys her underpants in packs of three.
她总是成三件地买内裤。
Make sure your underpants match your outfit; it's all about the details.
确保你的内裤与你的服装相配，细节决定一切。
His underpants were hanging on the clothesline in the backyard.
他的内裤挂在后院的晾衣绳上。
The comedian joked about wearing his brother's underpants by mistake.
这位喜剧演员开玩笑说他不小心穿了他兄弟的内裤。
She prefers cotton underpants for comfort and breathability.
她更喜欢棉质内裤，因为它们舒适透气。
The underpants were too tight, causing discomfort throughout the day.
内裤太紧，导致一整天都不舒服。
He decided to donate his old underpants to a charity that helps the homeless.
他决定把他旧的内裤捐给一个帮助无家可归者的慈善机构。
In some cultures, it's considered unlucky to wear red underpants on New Year's Eve.
在一些文化中，新年除夕穿红色内裤被认为是不吉利的。