A bridgehead was established.滩头阵地建立起来了。Bridged bicyclooctanes gave no significant bridgehead substitution.桥二环辛烷不给出有意义的桥头取代.The Analysis and Preventive Measures of Bump Reason at Bridgehead.桥头跳车原因分析及预防措施....
He cleared his throat, and went on with his summing-up report.他清了清嗓子，继续做总结报告。This led us to make a summing up of the experience and lessons.这促使我们对经验和教训进行了总结。We must take a serious attitude in summing up our work, and not...