jupiter 发表于 2020-3-15 09:46# K, p+ s, X; B$ r' X5 n
“阴天或多云的天,紫外线反而因为漫反射,会比阳光直射时更强。”5 ?9 w# b+ y: M2 J" r, @9 C
" A0 t) c+ w# a这还是第一次听说。 ...
- z6 v) z4 K* [4 G4 [" s5 OCLOUD COVER, if heavy can blockmost UV radiation. Thin or brokenclouds allow most UV rays through. Puffy, fair weather clouds deflectrays and can increase UV radiationreaching the surface.; r2 i$ W O5 Y) c5 _/ N
https://www.epa.gov/sites/production/files/documents/uviguide.pdf" j7 A M, t: h2 B& i, V
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