解开打结的鞋带 untie the knot in the shoelace
A:I can't untie the knot in the shoelace.
我解不开打结的鞋带。
B:Let me help you.
让我来帮你。
knot /n?t/ n.(绳等的)结
解开鞋带 untie/undo one's shoelaces
A:Why are you undoing your shoelaces?
你为什么要解开鞋带?
B:I want to take off my shoes. There are some sand in my shoes.
我想要脱鞋。我鞋里有沙子。
untie /?n?ta?/ v. 解开,松开;解除
把鞋带清洗干净 clean shoelaces
A:I have a headache. Could you do me a favor and clean my shoelaces?
我头痛。你能帮我个忙,把我的鞋带清洗干净吗?
B:I'm sorry, but I've got to prepare for my coming exams.