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We'll have a reaction vessel that's sealed, it's constant volume.
Maintenance for a given body design of an organism is relatively constant.

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Open the tool →恒定 (héng dìng) means “Constant and stable”.
恒定 is pronounced héng dìng in Mandarin Chinese.
“Constant and stable.” is 恒定 (héng dìng) in Chinese.
This page has 2 example sentences using 恒定, each with pinyin and an English translation.