因结构更为简单、尺寸体积更小，既省料又可简化制造工艺，制造成本降低。
Because the structure is simpler and the dimension volume is smaller, the materials are saved, the manufacturing process is simplified, and the manufacturing cost is reduced.
且尺寸体积远小于同流量的容积式压缩机，稳定性和压比也比同流量的条件下的叶轮式压气机有所提高。
But it has smaller volume than displacement compressor at the same mass flow rate; and higher pressure ratio and efficiency than impeller compressor.
增加的不只是键盘宽度，还有上网本的屏幕尺寸、超级硬盘的占用空间、附加端口、体积更大的电池—当然还有重量。
With the increase in keyboard width came an increase in the netbook's screen size, room for a fairly hefty hard-drive, additional ports, a bigger battery-and yet more weight.
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