diaper
noun [ C ] US uk/ˈdaɪ.pər/ us/ˈdaɪ.pɚ/ (UK nappy)
尿布
a square of thick soft paper or cloth that is fastened around a baby's bottom and between its legs to absorb its urine and solid waste
disposable/reusable diapers 一次性／可重复使用的尿布
diaper cream 护臀霜
She was changing the baby's diaper. 她在给婴儿换尿布。
I knew William when he was still in diapers (= when he was a baby). 威廉还穿尿布的时候我就认识他了。