人们对农业上灭草剂和杀虫剂的用量非常担忧.There is a lot of concern over the amount of herbicides and pesticides used in farming.尽管此方法涉及使用灭草剂的化学药品来去除这些已存的青草.Still another involves using an herbicide chemical to kill the existing grass....

“灭草剂”的英语可以翻译为：herbicide ...