The results show that the technique has significant effect on yield improvement, and the mechanism is the increase of secondary roots and the change of yield component.
试验结果表明，春小麦机械覆膜穴播增产效果达到极显著水平，其增产机理主要为小麦次生根数的增加和产量结构的变化。
The yield and tensile strength of the welded joints of the two kinds of materials increase under dynamic loading and prestrain condition that have little effect on the plasticity of structural steel.
两种材料焊接接头在动载和预应变下的屈服强度和抗拉强度均有所提高，但对其塑性影响均不大。
The connotation of disaster mitigation effect in disaster economics, in a broader sense, refers to that investment in disaster mitigation will not only increase in value, but also yield new value.
对灾害经济学减灾效益的内涵可进行拓展，即地质灾害的减灾投入不但可以产生升值作用，也可以产生出新的价值。
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