水下防御是航母作战的重点和难点。
On the battle of aircraft carrier underwater defense is difficulty and the focal point.
譬如，海带缠潜艇的设想已经被一名机械工程专业的研究生马磊付诸实践，转化成为了一种水下防御系统，并申请了国家专利。
For example, Ma Lei, a mechanical engineering graduate, has invented an underwater defense system based on Zhang's hypothesis and it has been patented by China's State Intellectual Property Office.
大约40名船员即可完成舰船的航行和维护。除此之外，还需要35名船员来完成一些专业性任务，比如空中防御，水下战事和水面攻击。
A crew of around 40 sail and maintain the ship, whilst another crew of up to 35 are in place to carry out specialised missions, such as air defence, underwater warfare and surface attacks.
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