This test ensures that the enclosure will not react chemically with your photos.

摄影活性测试能确保封套不与您的照片发生化学反应。

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The latter process occurs at low temperatures when rocks rich in the minerals olivine and pyroxene react chemically with water, releasing methane.

BBC: Martian methane mystery deepens

If the toilet is not working, one has to go into a baggy that has ampules that can be crushed to chemically react with the waste to prevent things like offgassing and bacterial growth.

FORBES: How Does The Restroom In The International Space Station Work?