如何改进学校的事务而不增加其成本？
How to improve institutional food without increasing its cost?
某些授衔令只提高军衔而不增加工资。
Some kinds of commissions promote a military officer only in rank without any increase in pay.
发散透镜只增加水平发散角而不增加垂直发散角。
The divergent lens only enlarges the Angle of horizontal divergence and not the Angle of vertical divergence.
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