flat slope

例句：

1. 1. The road is very flat, so it's easy to drive on it.
   这条路非常平坦，所以很容易在上面行驶。
2. 2. The table is flat, so it won't be difficult for you to clean it.
   桌子很平整，所以清理起来对你来说不会太难。
3. 3. The floor of the room is flat, which makes it easy to clean.
   房间的地板很平整，这使得清洁起来很容易。