我们已习惯于依赖的三种主要运输方式是:陆路，水路和空中运输。（4分）
We have come to depend on the availability of three principal kinds oftransportation:land,sea,and air.
我们已习惯于依赖的三种主要运输方式是:陆路，水路和空中运输。（4分）
We have come to depend on the availability of three principal kinds oftransportation:land,sea,and air.
