They also use less water and nitrogen.

此外，C4植物对水和氮气的需要量也较少。

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Always use an external source of nitrogen or air for this purpose.

做类似事情时，只能用氮气或空气作为外在气源。

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Always use an external source of nitrogen or air for this purpose.

做类似事情时，只能用氮气或空气作为外在气源。

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