| 单词 | 方向性 |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔barking up the wrong tree〕She claims that researchers are barking up the wrong tree by focusing on conventional forms of treatment for the disease.她声称，研究人员将注意力集中在这种病的常规疗法上是犯了方向性错误。韦氏高阶〔commutate〕To reverse the direction of (an alternating electric current) each half-cycle to produce a unidirectional current.变换电流方向：颠倒每一半周（交流电流的）方向，以产生单方向性电流美国传统 |
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