一个黑洞被气体围绕，就好像一只被食槽环绕着的猪。
地球围绕自己的轴线旋转为每24小时一周，即一天；地球环绕太阳一次的时间为一年。
Our earth turns on its axis once in every twenty-four hours, and goes also round the sun once a year.
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。
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.
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