Its energy saving effect was proved by on-the-spot test.
现场测试表明该技术节能效果良好。
The carpenter, to test the master, marked the spot and then pretended he had forgotten.
木匠想考考大师，在正确位置上作了标记以后，他假装忘了。
The carpenter, to test the master, marked the spot and then pretended he had forgotten.
木匠想考考大师，在正确位置上作了标记以后，他假装忘了。
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