回旋镖飞去又能飞回，这一特点使它成为旅游业和交通业钟爱的行业标志。

The boomerang's ability to return has made it a favourite symbol for the tourism and transport industries.

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这将标志着人工智能行业向前迈进了一步。

It would mark a step forward in the AI industry.

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根据象形文字所做的标志，可以辨别这些人的行业：例如，供盐的人、供烟草的人和分配玉米稀饭的人。

Hieroglyphic captions identify some people by their trades: salt person, tobacco person, and maize-gruel person, for example.

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