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A lead plate crosses the chamber and evidently the particle has passed through it.
In an updated version of a cloud chamber the researchers are recreating the Earth's atmosphere.

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Open the tool →云室 (yún shì) means “cloud chamber”.
云室 is pronounced yún shì in Mandarin Chinese.
“cloud chamber” is 云室 (yún shì) in Chinese.
This page has 2 example sentences using 云室, each with pinyin and an English translation.