许多城市正在投资建设更好的公共交通。

Many cities are investing in better ___public ___transportation.

为了减少污染，更多人应该使用公共交通。

To reduce pollution, more people should use ___public ___transportation.

这个地区的公共交通非常可靠且便宜。

The ___public ___transportation in this area is very reliable and cheap.