n.无法实施，不能实施的事项...

impracticability的音标：impracticability的英式发音音标为：[ɪmˌpræktɪkə'bɪlətɪ]impracticability的美式发音音标为：[ɪmˌpræktɪkə'bɪlətɪ]...

Subjecting the models field engineering calculating test shows its safety, rationality, simpleness and practicability.工程实例计算表明本模型是安全合理 、 简单实用的.I cannot help but be impressed with the practicability of this education.这种教育...