Comparing with the outer,there is low PAR (photosynthetically act ive radiation) and UV-B in inner of winter plastic greenhouse.是什么意思_Comparing with the outer,there is low PAR (photosynthetically act ive radiation) and UV-B in inner of winter plastic greenhouse.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句