Crops grown in the winter in northern climes receive very little UVB to begin with, and plants in greenhouses are further shielded from UVB by the glass walls.
在冬季生长的农作物由于北方的气候只能收到一点点的UVB招生，并且温室中的植物还受到了玻璃墙进一步的保护。
Crops grown in the winter in northern climes receive very little UVB to begin with, and plants in greenhouses are further shielded from UVB by the glass walls.
在冬季生长的农作物由于北方的气候只能收到一点点的UVB招生，并且温室中的植物还受到了玻璃墙进一步的保护。
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