three-memberCOCA⁵⁶³³⁹BNC⁵⁸⁵⁸²iWeb⁴¹⁷²³Economist³⁴³¹⁸⁺³ 例句 The three-member ring structure transition region and structure transition state were found out. 得到了各反应通道的结构过渡区和结构过渡态。 cnki The result shows that the transition state of the rearrangement reaction is a three-member ring structure external the molecular plane. 结果发现，该重排反应经过一个面外三元环过渡态。 cnki