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However,their effects upon the rice leafhopper,Empoasca subrufa Melichar,remain to be carefully investigated.Experimentswith adults were conducted both in the laboratory and in the field.The resultsmay be summerized as follows:1.Spraying with 25% DDT emulsion in 200-300 parts of water killed over90% of the leafhoppers,whereas in 400 parts of water,it gave an unstable kill-ing effect ranging from 75% to 90%.Dus...

田间使用 DDT 防治白翅叶蝉的残效期约为10—12天。666单独用来防治白翅叶蝉效果甚差，但与 DDT 混合使用有增效作用，残效期与单独使用 DDT 相似；二者混用是最合理的施用方式，可以节省 DDT 用药量，减低药费，同时对多种稻虫可收综合防治之效。25%DDT 乳剂和6%可湿性666按1∶1∶400及1∶1∶600混用，其毒效相当于单用 DDT 1∶200及1∶300者；用1∶1∶500喷射效果比单用 DDT 1∶300者还略高；5% DDT 粉剂和0.5%666粉剂按1∶1混用，其毒效也和单用5% DDT 粉剂相接近。

Enhancement of the solid portion is highly variable, ranging from non-enhancing to ring-like to intense homogeneity.

实性成分的强化也是高度可变的，从无强化到环状到均匀强化都可以出现。

He had dealt with problems ranging from substance abuse, to in fidelity , to domestic violence.

他处理过无数的婚姻，从吸毒、到婚外情、到家庭暴力。

He had dealt with problems ranging from substance abuse, to infidelity, to domestic violence.

他处理过从滥用药物到婚外情到家庭暴力的各种问题。

He had dealt with problems ranging from substance abuse to infidelity to domestic violence.

他已经处理了一系列的问题从滥用药物到通奸到家庭暴力。

He had dealt with problems ranging from substance abuse, to infidelity, to domestic violence.

他处理过无数的婚姻，从吸毒、到婚外情、到家庭暴力。

Buyers seek out particular types and brands of goods and services. Examples can be any type of goods ranging from fine foods to custommade automobiles or a service such as management consulting advice.

消费者会寻求特定类型和品牌的产品和服务，例如精美食品、定制的汽车等各种商品，或者像管理咨询建议这类服务。

Buyers seek out particular types and brands of goods and services. Examples can be any type of goods ranging from fine foods to custom-made automobiles or a service such as management consulting advice.

消费者会寻求特定类型和品牌的产品很服务，例如精美食品、定制的汽车等各种商品，或者像管理咨询建议这类服务。

Stolen valuables ranging from jewellery to model trains have been put on display by police.

警察展示了被盗的贵重物品，从珠宝到模型火车都有。

Today the Trinities still bear the scars of extensive gold mining operations, ranging from placer mining that rerouted river and stream beds to a scattering of abandoned mining tunnels, some of which were operated into the 1930s.

今天，特里尼迪山上淘金留下的创伤依然无处不在，从河流和河床的改道，到无处不在的废弃金矿。有些金矿一直开采到20世纪30年代。

Apllied the data of QuickBird-2——the highest resolution remote sensing,and based on the theory and methodology of fractal geometry,we have quantitatively studied remote sensing lineations in Gaolong gold deposit of Guangxi.

采用Quick Brid-2高分辨率卫星遥感数据，通过分形几何学的盒计维数法，定量研究广西高龙金矿区遥感线性构造。

So, sometimes, to change the color can not be your food (referring to the above-mentioned crustacean) has been a sign of boiling over.

所以，有时，来改变颜色，不能你的食物一直是沸腾了的迹象。