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- pests occurence rule 虫害发生规律
- The highly specific activity of Bt insecticides might limit their use on crops where problems with several pests occur, including non-susceptible insects (aphids, grasshoppers, etc.). 专化性强，当几种害虫同时发生时对不感染性害虫如蚜虫和蝗虫不能兼治。使用受到限制。
- It is a hard work to deal with the problem above, firstly we must understand the reason , occurence rule and traits of various harms , and secondiy establish correspond control strategy and methods. 解决以上问题是一项艰巨的任务，首先我们必须理解各种病害发生的原因，规律和特点，其次建立对应的控制策略和方法。
- Ivela ochropoda is one of the main defoliator pest occurred in Ulmus pumila, and is very serious in Wuqi County. 摘要榆毒蛾是榆树的食叶害虫之一，在吴起县发生严重。
- They use ultraviolet lamp to kill pests. 他们使用紫外线灯杀死害虫。
- Stores of grain are frequently attacked by pests. 储存的谷物经常受到害虫的破坏。
- The potato is vulnerable to several pests. 马铃薯易受几种害虫的侵害。
- The Ching court began to feel its rule threatened. 清廷开始感到自己的统治受到了威胁。
- But this does not rule out unofficial discussions. 但这并不排除进行非正式的讨论。
- The spread of pests damaged countless fruit trees. 虫害的蔓延损害了无数果树。
- The rule is inapplicable to this occasion. 那规则对这一场合不适用。
- In those days they had to fight the pests barehanded. 那时候他们得赤手空拳和虫害作斗争。
- Food shortage often occur in times of war. 战争期间常发生粮食短缺现象。
- I did the calculation by the rule of three. 我是根据比例运算法则计算出来的。
- One who believes the millennium will occur. 千禧年信奉者相信千禧年会复活的人
- It is up to the courts to rule on this matter. 这得靠法院对这事作出裁决。
- I'm afraid that the judge might rule against him. 恐怕法官的判决会于他不利。
- Therefore, the hornification problems of recycled fibers including the affecting factors, occurring rules , that sort of things were then studied. 纤维及其纸页的一系列变化归根结底是由二次纤维角质化损伤引起的。
- Didn't it occur to you that he was lying? 你当时没想到他在撒谎吗？
- I make it a rule to take a short walk after lunch. 我习惯在午饭后散散步。
