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。
youdao
I've lost the lid of the saucepan.
我把这个炖锅的盖子弄丢了。
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