由于南非的煤炭资源埋藏浅而且储量丰富，南非的煤炭工业包括大量小公司，它们拼命地寻找途径来出口其煤炭。

Thanks to shallow and abundant coal reserves, South Africa's coal industry includes a multitude of small companies desperately looking for access to export markets.

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论述了人工智能的原理，包括其含义、研究的基本内容、研究领域及研究途径，然后给出了人工智能系统在超声检测(UT)中的应用示例。

The principles of AI, including its definition, basic study contents, study areas and approaches are interpreted and a basic AI system used in ultrasonic testing (UT) is illustrated.

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