width at tooth space root

例句：

1. 1. The width of the road is 20 meters.
   这条道路的宽度是20米。
2. 2. The width of the river is about 50 meters.
   这条河的宽度大约是50米。
3. 3. The width of the bridge is sufficient for two cars to pass through.
   这座桥的宽度足够两辆车同时通过。