Bell 指的是赛车内部一根能够传递空气的导管，它能够影响尾翼的空气动力情况从而在Sakhir赛道的两条大直道上提供额外的速度。
Bell was referring to an internal tube carrying air that can affect the aerodynamics of the rear wing and provide extra speed on the two long straights on the Sakhir track.
XML Schema不能请求特定的根元素(因此，即使验证最简单的文档也要求额外的信息)。
XML Schema cannot require a specific root element (so extra information is required to validate even the simplest documents).
在建立了根名称之后，添加额外的字段来指定词汇表名称和版本号。
Once you have a root name established, add on extra fields to specify vocabulary names and version numbers.
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