The causal relationship between vicious talk and violent action is far less certain.
威胁性话语和暴力行为没有必然的因果关系。
Whether it will reverse the slow decline of the past decade is far less certain.
它是否能扭转过去十年间的缓慢滑坡尚不得而知。
XPath and XSLT are useful for certain "data querying" purposes, but their application is far less broad and general than that of RDBMSs, and SQL, in particular.
虽然XPath和XSLT可用于某些特定的“数据查询”，但它们的应用远不及rdbms和(尤其是)SQL的应用广泛和普遍。
Evaporation ducts, or tropospheric ducts in general, can guide radio waves to distances far beyond the horizon with less attenuation, and then severely impair some certain radio wave system.
以蒸发波导为代表的对流层大气波导传播，可使电波在较小的衰减下沿波导传播得很远，从而严重影响合适的无线电系统。
Evaporation ducts, or tropospheric ducts in general, can guide radio waves to distances far beyond the horizon with less attenuation, and then severely impair some certain radio wave system.
以蒸发波导为代表的对流层大气波导传播，可使电波在较小的衰减下沿波导传播得很远，从而严重影响合适的无线电系统。
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