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- It is not my contention that chemical insecticides must never be used. 我不是说人类决不能使用化学杀虫剂。
- The control of cucurbit wilt has been based on chemical insecticides applied for beetle control. 防治葫芦科植物萎蔫病，至今仍依靠使用化学药剂防治甲虫。
- Similarly, the discovery that plants can be "vaccinated" against disease by equipping them with viral genes ought to reduce their reliance on chemical insecticides. 与此类似，给植物注入病毒基因可以使其通过“接种疫苗”增加搞病性，这一发现，可以减少植物对化学杀虫剂的依赖。
- D.sibirica Telenga acts as a dominant parasite of Liromyza larvae.The rate of parasitism varies in different crops,seasons and environments,and can be greatly influenced by chemical insecticides. 后者数量不多,而前者是当地的优势寄生蜂,其寄生率常随作物、季节、环境等因素而变化,化防的影响更大。
- This article reviews mechanisms of several insecticides used to control mosquito,including chemical insecticides, Bacillus thuringiensis(Bt)insecticides and other kinds of bioinsectides. 本文综述了化学杀虫剂、细菌性生物农药、植物源生物农药的防治机理;化学杀虫剂的抗性机理及抗性在我国产生的情况;
- D. sibirica Telenga acts as a dominant parasite of Liromyza larvae.The rate of parasitism varies in different crops, seasons and environments, and can be greatly influenced by chemical insecticides. 后者数量不多，而前者是当地的优势寄生蜂，其寄生率常随作物、季节、环境等因素而变化，化防的影响更大。
- chemical insecticides and fungicides 化学杀虫剂与杀菌剂
- It lacks transmission and spreading facilities, it must be applied like a chemical insecticide. 缺乏传播扩散工具，只能象化学药剂一样施用。
- The index of population density of dominant insect pest was increased greatly in those tea gardens with higher chemical insecticide expense, especially for tea leaf hopper (Empoasca vitis Gotho). 农药费用高的茶园优势害虫种群密度大，尤以假眼小绿叶蝉明显。
- A reactor is a container for chemical reaction. 反应器是进行化学反应的容器。
- The chemical symbol for copper is "Cu". 铜的化学符号是Cu。
- We are doing a chemical experiment. 我们正在做化学实验。
- One is plant very ticklish is cosmopolitan pest cole moth, chemically insecticide kills more more. 有一种很难对付的世界性害虫小菜蛾，用化学杀虫剂越杀越多。
- My major is the subject of chemical engineering. 我的专业是化学工程学。
- Ammonia is a chemical substance. 氨是种化学物质。
- A chemical derived from petroleum or natural gas. 石油化学制品从石油或天然气中提炼出的化学产品
- Beware how you handle the toxic chemical. 小心处理有毒的化学药品。
- The chemical can behave as an acid. 这种化学制品能起酸的作用。
- Some chemical compounds can be resolved by heat. 一些化学化合物可以通过加热分解。
- I am not familiar with chemical terms. 我不熟悉化学术语。
