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.
英国和法国牢固的空中防御，强大的海上力量，充裕的人力物力和不屈不挠的精神，确保了他们自卫的能力。
The air defenses of France and England, their greatly superior naval strength, their manpower, their resources, their resolution, make it certain that they can defend themselves.
这种优势被认为是必不可少的，因为英国人具有超群的海上技能和技术，并且打的是一场防御战争，使它能以少胜多。
This advantage was deemed necessary because of Britain's superior sea skills and technology, and also because Britain would be fighting a defensive war, allowing it to win with fewer forces.
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