Our constant flow gravel bed system grows lettuce about 20% better than a reciprocal flow.Gravel beds and floating rafts are about 15-20% more efficient than NFT.是什么意思_Our constant flow gravel bed system grows lettuce about 20% better than a reciprocal flow.Gravel beds and floating rafts are about 15-20% more efficient than NFT.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句