对于一个70%都被海水覆盖的地球而言，海上防御对于一个国家的安全有着极其重要的战略意义。
Safeguard on sea is most important for countries'safety especially for the earth which nearly 70% are covered by water.
对于一个70%都被海水覆盖的地球而言，海上防御对于一个国家的安全有着极其重要的战略意义。
Safeguard on sea is most important for countries'safety especially for the earth which nearly 70% are covered by water.
应用推荐