How planetary nebulae can form such complex structures, however, is a hot debate among professional astronomers such as Jacoby.

然而，关于行星星云如何形成这么复杂的结构，却在Jacoby等专业天文学家中引发了一场热烈的争论。

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This article discussed the hot topics focusing on Dolby Digital and surround sound technologies, with a probing into some professional issues related to the HDTV audio domain.

本文围绕杜比数字和环绕声技术等热点话题，探讨了有关高清晰度电视音频领域的一些专业问题。

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Professional anger- management trainers say that in most cases anger isn't an illness but a normal human emotion that causes problems when it flares too hot, too often.

专业的愤怒管理培训师表示，在大多数情况下，愤怒并不是一种疾病，而是一种正常的人类情绪，只不过在过度、过于频繁发生的时候才会导致问题。

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The National Hot Rod Association, which represents professional drag-racing, has also tried to help, encouraging affiliated tracks to open their facilities to street-racers for safe, controlled contests.

ECONOMIST: Another reason to stay home at night

In reality, only professional money managers and well-heeled investors get into a hot deal at this price.

FORBES: A decade of new issues

From its humble beginnings (for a while, the fire-fighting force consisted largely of drunks and vagrants) the service gradually became more professional, developing new techniques and introducing smokejumpers (special teams that parachute into hot spots).

ECONOMIST: Fire in the west: Another costly war that America can never win? | The