be effective

• Contour planning with or without terracing is effective in conserving both soil and moisture .
  等高栽植，无论做或不做梯田对于保持水土都能有效。
• Certain soluble extracts of b pertussis may prove to be effective without engendering serious side effects .
  某些可溶性百日咳杆菌提取物，可证明用之有效，也不产生严重副作用。
• Virtually the only way that a staff guy can be effective is if he's come up through the line .
  实际上，要使一个办事人员能起到有效的作用，最好的办法是从第一线人员中选拨上来。
• All the tetradentate ligands were found to be effective with copper, which forms planar four-coordination complexes .
  所有四价配位体对铜都有钝化效果，能与铜形成平面的四价配位络合物。
• Recent studies suggested that erythromycin may be effective in prophylaxis against pertussis in exposed, susceptible persons .
  最近的研究提示，红霉素对暴露于百日咳的易感者，在预防上有效。
• The hydrogenation of olefins affords an example where both heterogeneous and homogeneous catalyses are effective .
  烯烃的加氢反应就是这样的一个例子，对它说来均相催化和多相催化都是有效的。
• It has been the responsibility of the engineers to synthesize this basic knowledge into practical systems of wastewater treatment that are effective and economical .
  工程师们的任务就是把上述基础知识综合运用到经济有效的实际废水处理系统中去。
• Eg . aspirin is effective in relieving some pains
  阿司匹林对治疗一些疼痛有效。
• The case study shows that this algorithm is effective
  实例表明该算法是有效的。
• This act shall be effective as of january 1 , 1979
  本法案应于1979年1月1日生效。