不幸的是，由于海洋环境的复杂性和海水传播媒介的特殊性，人类探测海洋的手段受到了极大的限制。

Unfortunately, the complexity of the Marine environment and the special properties of seawater as propagating medium have placed limitations on the means of the underwater exploration.

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大众传播媒介是传递信息、实现沟通、促进交流、塑造形象的重要手段。

Mass media are important means of message transmission, communication, and the creation of images.

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