在每个教室有一个计算机控制投影仪。
In each classroom there is a computer which controls a projector.
在每个教室都有一个控制投影仪计算机。
In each classroom there is a computer which controls a projector.
当教室人数大于零时，启动照明控制系统。
When the number of students is greater than zero, the system is started.
当教室人数大于零时，启动照明控制系统。
When the number of students is greater than zero, the system is started.
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