flat topography

例句：

1. 1. The road is very flat, which makes it easy to drive.
   这条路非常平坦，这使得驾驶变得很容易。
2. 2. The table is flat on one side, which makes it difficult to eat.
   桌子的一面是平的，这使得吃饭变得很困难。
3. 3. The floor of the room is flat, which makes it easy to clean.
   房间的地板是平的，这使得清洁变得很容易。