没有任何证据证明广播行业的竞争曾经使成本降低。
There is no evidence whatever that competition in broadcasting has ever reduced costs.
晶闸管是瞬间工作，可采用小电流管，使成本降低。
Because the thyristors work instantaneously, low current thyristors are used, then cost is reduced.
我们正想法使行政管理的成本稳步降低。
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