If they really wanted a 'stealth' helicopter they should have looked into creating something similar to the Comanche which has a covered fan that provides more torque while reducing noise.
如果他们真的想要隐形直升机，他们应该创造一个类似于科曼奇能够覆盖住螺旋桨并能提供更大的扭矩而且能缩减噪音。
There is information indicating that the prefabricated residential rate to reach 37% once, you can save water and 36% reduction in electricity consumption by 31 percent, while reducing noise;
有资料表明，住宅的预制率一旦达到37%，就可以节约用水36%，节约用电31%，同时降低噪声；
Because water can conduct heat about 30 times faster than air can, a water cooling system allows the processor to run at higher speeds while drastically reducing system noise.
因为水可以比空气传热快约30倍，水冷却系统允许处理器运行在更高的速度大大减少系统噪音。
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