Unfortunately, this saving in material weight is balanced by the higher cost of the higher quality materials needed in prestressing.
不幸的是，这种节能材料的重量是平衡的预应力需要更高质量的材料成本较高。
The piston with the combined magnetic ring installed may be one integral structure with slot, and this results in saving in material and making cost, and easy installation of the ring to the piston.
安装本发 明磁环的活塞，活塞可以做成带槽的一体结构，节约了活塞加工的原材料 和加工费，磁环在活塞上的安装过程省时又省力。
They had ideas for building houses from the roof downwards, turning rocks into soft material, making rivers run uphill, and saving sunshine in bottles.
他们的主意有从屋顶向下建造房屋，把石头变成软物质、让河流上山坡、把阳光储蓄在瓶子里。
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