standard crop的意思|示意

He practiced crop rotation and soil conservation a century before these became standard practice, and he invented a plow superior to any other in existence.

他练习作物轮作、水土保持一个世纪之前，这些被成为标准的做法，他发明了一种犁优于其他任何存在。

China says the tougher standard on foreign material is needed to protect against crop disease.

中国称之所以强化外国原材料的检验标准，是为了防止农作物病害的发生。

Submissions, addressing the topic of agricultural diversification and crop alternatives to tobacco, must not exceed five (5) pages (standard size paper and type), including attachments.

有关农业多样化和烟草作物替代产品主题的递交稿不能超过5页(标准纸和打字)，其中包括附件。