For many years,chemical fertilizers and pesticides have been employed on a sound basis. Many measures have been taken to protect grasslands,such as enclosure with fences for livestock breeding and irrigation.是什么意思_For many years,chemical fertilizers and pesticides have been employed on a sound basis. Many measures have been taken to protect grasslands,such as enclosure with fences for livestock breeding and irrigation.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句