Comparable and reliable data are often lacking and can only be built up gradually . 可靠而又可比的资料常感缺乏，这种资料只能逐渐积累起来。
One of the most compelling needs for readers in the 1980s was reliable information about shopping . 本世纪80年代读者最迫切需要之一，是得到购物的可靠信息。
This is due to a paucity of reliable evidence on the comparative advantages of the various species combination . 原因是缺乏对各种混合种类相对利益的可靠证明。
By 1853 creosote had established itself as a most reliable and persistent wood preservative . 1853年以前，防腐油已作为最可靠并能持久的木材防腐剂，而确立了它自己的地位。
To cover the large area which this work comprises i have tried to select the most reliable sources . 为着使本书能包罗所涉及的这个大范围，我曾经试着选择最可靠的原始资料。
When measuring a shallow diffused layer at low concentrations, reliable measurement free of noise are difficult to make . 测量低浓度浅扩散层时，无干扰的可靠测量很难实行。
Furthermore, the coverage of many of these surveys is too limited to provide reliable nationwide estimates of income distribution . 而且，许多这类调查工作的对象范围太窄，不能提供全面范围收入分配的可靠数字。
This is unfortunate since it would be helpful to have reliable data for the fine particle systems commonly used in fluidized beds . 这是很遗憾的，因为如能取得流化床常用的微细颗粒系统的可靠数据，则将大有帮助。
