在其他的一些试验中规则被稍作改动，以便于验证一些其他理论。
The rules were changed slightly in different trials so that it was possible to test a number of theories.
因为不用改动操作系统，实现容易，便于推广。
Because it needn' t modefy the operating system, this method can be easy realized and spread.
该系统具有结构简单，对原机改动小，便于安装，成本低等优点。
It has many advantages such as its simple structure, less modification to engine and low cost etc.
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