He conducted a similar experiment to establish how much energy was saved by placing a lid on a saucepan when boiling water.
他还进行了一个类似实验，确定烧水时在锅上盖上盖子能节约多少能源。
He conducted a similar experiment to establish how much energy was saved by placing a lid on a saucepan when boiling water.
他还进行了一个类似实验，确定烧水时在锅上盖上盖子能节约多少能源。
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