Using thermotherapy, meristem culture and chemical preparation may provide effective ways for obtaining virus-free materials of pear.

热处理、茎尖培养、化学制剂处理及其联合应用为梨病毒脱除提供了有效途径。

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It is concluded that above two kinds of methods provide effective ways for connecting quickly the results of agricultural land gradation and the second national land survey.

研究结论：结果传递法和参数传递法为县级农用地分等成果与二调成果的快速衔接提供了有效的途径和方法。

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Numerous channels for public opinion are available now in the 21st century. In addition to the print and electronic media, forums online provide effective ways to make one's voice heard.

现在已是21世纪，表达民意渠道多不胜数，传统的报章和电子传媒外，网上论坛也是有效途径。

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He also called for a deeper commitment to basic education across the continent, where school enrollment levels are dangerously low in some regions, and called on western pharmaceutical manufacturers to work to find cost-effective ways to provide preventative medicines and vaccines to curb the high rates of AIDS and tuberculosis through much of the continent.

CNN: Clinton says U.S. will be 'friend for life' of Africa