Proper infection dosage and routes were selected to make the chickens artificially infect avian colibacillosis successfully.选择适宜的攻毒剂量和攻毒途径,诱发淮南麻黄鸡大肠杆菌病....
Marco Polo’s travelogue mentions that Kublai Khan sent envoys to Malgache.马可波罗游记中提到忽必烈曾派使节到马尔加什。Not long after Marco came home, the Genoese captured him during a battle at sea.马可-波罗回到家乡不久,在一次海上的战役中被热那亚人俘虏.Tropical storm ...
Before we left the camp, my twin brother and I moulded a chair out of mud.离开营地前，我和孪生弟弟用泥巴做了一把椅子。The boy moulded clay into balls.这男孩把黏土做成球.They moulded a figure in clay.他们用模子做泥塑人像.Plasticine is soft and can be moulded , l...