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The chemical weedicide can weed with high efficiency while the extensive spraying causes high cost and the destruction of entironment. Variable rate spraying was presented against these disadvantages.

虽然使用化学除草剂可以高效地进行除草，但由于化学除草剂所采用的普遍方式为粗放式喷洒，不仅浪费大，而且造成了生态环境的破坏，针对这一弊端，提出了变量喷洒。

The method is simple, has safe operation, creates an approach utilizing a plant gene to safely select the marker gene for the tomato genetic transformation, can replace the disadvantages caused by the widely used heterogenous genes such as antibiotic genes, weedicide resistant genes, xyl A, pmi, GUS and so on, taken as marker genes, obtains a transgenic tomato with food safety, biological safety and ecological safety, relieves the public from anxiety of marker gene safety, and inevitably facilitates the commercialized application of the transgenic tomato.

该方法简单，操作安全，开创了利用植物基因作为番茄转化安全筛选标记基因的途径，能够代替目前广泛使用的抗生素基因、抗除草剂基因以及xylA、pmi、GUS等异源基因作为标记基因存在的弊端，获得具有食品安全性、生物安全性和生态安全性的转基因番茄，解除公众对标记基因安全性的顾虑，必将促进转基因番茄的商业化应用。

Currently,there are some disadvantages in the main field of social welfare administration in our country,which includes the law of social welfare,the institution of social welfare administration,the personnel of social welfare administration,the income and expenses of welfare fund.

19世纪20～30年代伴随着风险社会而来的日益增多的社会问题，促成了社会福利工作的系统化、行政化与专业化。

Well log and seismic data have their advantages and disadvantages in the study and interpretation of structural patterns.

将地震、测井结合起来研究构造形态是今后的发展趋势和方向。由于地下地质构造的复杂性，我们采用了人机交互的方式，发挥了解释专家的主观能动性。

Universal life insurance tries to overcome the disadvantages of whole life insurance.

通用人寿保险试图克服的缺点的整个生命保险。

One of the main disadvantages of that system is that it uses very large amount of electrical energy and the other is that the system's working substance can pollute the environment.

作为常规压缩式制冷空调系统的强有力竞争者和替代者，液体除湿空调系统是一种对大气污染小、耗电少，可以利用各种低品位能源驱动的新型空调系统。

These methods have the disadvantages of tedious workup, large amounts of thick acid and blood usage and so on.

目前，血样中汞的分析预处理方法主要采用常压湿法消化和微波消解法。

The article describes the advantages and disadvantages of worm gear drive s and the domestic and abroad research.

介绍蜗轮传动优缺点和国内外蜗轮研究现状。

Starting with the traits of zero order impedance and the relationship between zero order current and zero order impedance,analyzes the main differences of electric traits of power cable s and aerial lines and the disadvantages of applying power cable s into the traditional grounded protection.

从正、负、零序阻抗特性以及零序阻抗与零序电流的关系入手，分析了架空线路与电力电缆电气特性的主要区别及传统接地保护应用于电力电缆线路所带来的弊端。

Starting with the traits of zero order impedance and the relationship between zero order current and zero order impedance,analyzes the main differences of electric traits of power cables and aerial lines and the disadvantages of applying power cables into the traditional grounded protection.

从正、负、零序阻抗特性以及零序阻抗与零序电流的关系入手，分析了架空线路与电力电缆电气特性的主要区别及传统接地保护应用于电力电缆线路所带来的弊端。

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。