HSK 5 · noun
洞
hole; cave; opening (洞)
墙上有一个洞。
Qiáng shàng yǒu yí ge dòng.
There is a hole in the wall.
袜子上有个小洞，妈妈帮我把洞补好了。
Wàzi shang yǒu ge xiǎo dòng, māma bāng wǒ bǎ dòng bǔ hǎo le.
There is a small hole in my socks; Mum helped me mend it.
这个计划有一个很大的漏洞。
Zhège jìhuà yǒu yí gè hěn dà de lòudòng。
This plan has a big flaw.
他们在山里发现了一个很深的洞穴。
Tāmen zài shān lǐ fāxiànle yí gè hěn shēn de dòngxué。
They found a very deep cave in the mountains.