Within the error rang allowed, adopt simple and easy method to automatically prolong middle line of tunnel in order to reduce the influence to construction.
在误差允许范围内，采用简易方法自行延长巷道中腰线，以减少施工影响。
Automatically modulating the fan's rotational speed according to cooling requirement can not only reduce the power and fuel consumptions, but also reduce noise level and prolong the engine's lifetime.
根据冷却的实际需要自动调节风扇的转速，不仅可降低功率消耗、节省燃油，而且还可以达到降低噪声、延长发动机寿命等效果。
This agreement will be prolong one year automatically if both parties has no objection two months before the expiration date.
如果在此协议失效前的两个月前双方均没有提出异议，此协议将自动延长一年。
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