节约用水、用电，不浪费材料。
这个包虽然很小，但是很难做，也很浪费材料。
Although the bag is very small, it costs lots of work and materials.
产生这样的电气阻碍，不但浪费材料，低落产量，并且还会破损腾贵的电气设置。
Not only do these electrical failures waste material and cost the company in lost production, but they also can damage expensive electronics.
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