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Hydrogen is a colorless, odorless gas.
氢气是一种无色、无味的气体。
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Helium is a colorless and odorless gas.
氦是一种无色无味的气体。
When you smell an odorless gas, it is probably carbon monoxide.
你闻到一种没有味道的气体时，那可能就是一氧化碳。
CO2 is a colorless and odorless gas, exhaled at high concentrations by each of us, and a key component of the biosphere's life cycle.
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Carbon monoxide is a gas which is odorless tasteless and colorless.
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