常見例句雙語例句The dependence of chain scission and racemization on temperature results from molecular motion, "cage effect" and steric hindrance during recombination.分子量降低和消旋作用對溫度的依賴性，是由于分子運動和籠罩效應(yīng)以及重合的空間位阻效應(yīng)所致。Space steric hindrance resulted by length lateral chain and electrostatic repulsion of charged ion made the main contribution to water-reducing effect of PAA.自制PAA 系列的減水機理主要為其長側(cè)鏈引起的空間位阻作用及其帶電離子的靜電斥力作用。At the same time, we have also investigated the influence of the electric effect and steric hindrance effect of the substituents to the yields and regioselectivity.同時，我們還研究了取代基團(tuán)的電子效應(yīng)和位阻效應(yīng)對反應(yīng)產(chǎn)率和區(qū)域選擇性的影響。 返回 steric hindrance effect