这并不完全出自于全心全意的奉献精神：环保型引擎也需要更少的燃料，从而降低成本。
It is not just altruism: greener engines also use less fuel, and so cut costs.
忠诚度也建立信任，进一步让企业降低成本。
Loyalty also builds trust which further allow companies to reduce costs.
虽然这不能降低成本，但肯定也不会再增加成本。
在IP网络上开展语音业务也同样可以降低成本。
Advancing voice service over IP network may also reduce cost.
在IP网络上开展语音业务也同样可以降低成本。
Advancing voice service over IP network may also reduce cost.
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