Airliners would be jetting through the sky at 500 miles an hour.大客机会以每小时500英里的速度穿越太空.They placed very stable and accurate atomic clocks on regularly scheduled jet airliners.他们将非常稳定、准确的原子钟装在定期飞行的喷气式班机上.The fog grounded th...
Surgical training takes at least nine years, or 11 in the case of obstetrics...外科至少需要9年的专业训练，产科甚至需要11年。The training covers extended periods in obstetrics and gynaecology.该培训包括产科学和妇科学的增加课时。Moshe Hod, a professor of obstet...