数九寒天

tā men shǔ jiǔ hán tiān chuān zhuó lù yāo zhuāng dào chù xián guàng wǒ zhēn qí guài tā men jū rán bù dé zhòng gǎn mào

他们数九寒天穿着露腰装到处闲逛，我真奇怪他们居然不得重感冒。

I'm surprised they don't catch their death of cold, walking around with bare midriffs in mid-winter.