I heard the engines revving as the lorries backed and turned.卡车倒车和掉头的时候，我听见发动机的轰鸣声。Tractors and container lorries have completely obstructed the road.拖拉机和集装箱货车已经将这条路完全堵死了。Police cars, their sirens wailing, accompanied th...
It can be concluded that irradiated sterile insect technique is feasible for integrated controlling cotton bollworm.辐射不育技术作为棉铃虫综合防治的措施是可行的.In china, it is advanced on transgenic bollworm resistant cotton in the world.我国棉...