shoelace
noun [ C usually plural ] uk/ˈʃuː.leɪs/ us/ˈʃuː.leɪs/ (also lace); (US also shoestring)
鞋带
a thin string or strip of leather used to fasten shoes
My shoelaces came undone/untied. 我的鞋带松开了。
Do/Tie up your shoelaces, Rosie. 罗茜，把你的鞋带系好。