A：The trousers are getting looser and looser around the waist.
这条裤子的腰围变得越来越松了。
B：That's because you've been losing weight lately.Wear a belt if you don't want to have them tailored at the waist for the moment.
那是因为你最近体重越来越轻了。如果你暂时还不想改裤腰，就先系条腰带吧。
waist /we?st/ n. 腰，腰部；腰围
lately /?le?tli/ adv. 最近，近来
tailor /?te?l?(r)/ v. 修改；裁制
◆ for the moment 暂时；目前
系上腰带 fasten the belt