您要查找的是不是：
- prevent and kill off insect pests 防除害虫
- Experiments to prevent and kill off weeds in infant forest of tea trees and fruit trees 茶树、果树幼林中以五节芒为主的杂草防除试验
- Therefore, the network users must prevent and kill them. 为此 ,网络用户必须要防杀之。
- I think the Fremont come in and killed off the Little People. 我想后来的弗里蒙特人来到这里并杀害了那些小矮物。
- Then later the Utes come in and killed off the Fremont. 再后来犹他人来了，毁灭了弗里蒙特族人。
- The factory dumped the poisonous wastes into the river and killed off the fish. 工厂把有毒的废物倾倒在河里，毒死了河里的鱼。
- Prevention and killing off measure of soybean dodder 大豆菟丝子防除技术试验
- Efficient solution to prevent and kill co-ckroaches mice, fleas, bugs, mosquitoes, an-ts and flies. 病媒防治对象,有蟑螂、老鼠、跳瘙、壁虱、蚊蝇、白蚁。
- One must prevent and kill moths when collecting ancient calligraphy and paintings. 收藏古书字画，要注意定时防除蛀虫。
- Many governments are also focusing on hydro-electric power plants as a "clean" source of energy, but this means more dams which stem water flows and kill off fish populations, he added. 他还说，许多政府只注意到水力发电是一种清洁能源而建造水力发电站，岂不知这样做的结果是一道道的大坝阻止了水流，消灭了鱼类资源。
- Test Study on Preventing and Killing off Coeno-species Field Weeds in Maize Inbred Line and Hybrids Field 玉米自交系及杂交种田间杂草防除试验初报
- The factory dumped poisonous wastes into the river and killed off the fish. 工厂将有毒废料倾入河中，把鱼全毒死了。
- Instead, they chose to plunder and kill. 相反,他们选择劫掠和杀戳。
- Experiments of Different Herbicide Preventing and Killing off Weeds in Apple Orchard and Weeds Endurance 不同除草剂的除草效果及杂草的耐药性
- A case could be made out that it's more human to kill off these wild kangaroos. 人们可以提出理由，即杀光这些野袋鼠更为人道。
- The business of doctors is to prevent and cure diseases. 医生的职责是预防和治疗疾病。
- Frost can kill off a young plant. 严寒会摧毁幼苗。
- He is hit by a falling tree and killed on the spot. 一棵树倒下来，把他当场砸死了。
- The dog got among the sheep and killed many. 那只狗走入羊群并咬死了很多羊。
- The insecticide will kill off the insect pests. 这情形剂可消灭害虫。
