在陆地上钻探石油比在海上更便宜。

It is cheaper to drill for oil on ___land than at sea.

该条约导致了陆基导弹数量的大幅减少。

The treaty led to a dramatic reduction in the number of ___land-based missiles.

汽车是我们拥有的最快的陆地交通方式。

The car is the fastest way of transportation by ___land we have.