Warning: file_put_contents(/home/www/wwwroot/zidian/69228.com/cache/7b05bb39840bdf731d924a2340acab35.txt): failed to open stream: No space left on device in /home/www/wwwroot/zidian/69228.com/index.php on line 55 日韩欧美一区二区三区在线,久久精品国产亚洲Av麻豆
1. N the system of growing a sequence of different crops on the same ground so as to maintain or increase its fertility 輪作; 在同一塊田地上有順序地輪換種植不同作物的一種種植方式，目的是保持或提高土壤的肥沃度