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.

该条约导致欧洲陆基导弹数量大幅减少。

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

首先，汽车是我们拥有的最快的陆上交通工具。

Firstly, the car is the fastest way of transportation by ___land that we have.