Scientists at the agroforestry center say the use of fertilizer trees can reduce the need for chemical nitrogen by up to three-fourths.And they say it can double or triple crop production.是什么意思_Scientists at the agroforestry center say the use of fertilizer trees can reduce the need for chemical nitrogen by up to three-fourths.And they say it can double or triple crop production.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句