洞 , a Chinese measure word

洞 dòng

1. For holes or hole-shaped structures

   • 一洞桥桥 qiáoone single-arch bridge
   • 一洞大门大门 dàménone gateway
   • 一洞隧道隧道 suìdàoone tunnel bore
   • 一洞水磨one bay of water mills

2. For animals living in a burrow

   • 一洞老鼠老鼠 lǎoshǔone burrow of mice

3. For kinds, varieties

   犹 种 · 犹 番