Boron - substituted polyaromatic mesophase prepared by co - pyrolysis of a tar pitch with pyridine - borane complex under autogeneous pressure.以煤焦油沥青和吡啶硼烷为原料采用加压热缩聚工艺制备硼取代聚芳烃中间相沥青.A new syntan product prepared with tar p...
出人意料的是，自我催眠术只要上一次课就可以学会。Surprisingly, the ability to hypnotize yourself can be learnt in a single session.她去看了一位用催眠术帮她克服恐惧感的精神科医生。She saw a psychiatrist who used hypnotism to help her deal with her fear.达尔茜还看过一位精神科医生，他使用...
The areas are sealed off and ringed by troops.这些地区被军队封锁包围了。Helicopters with searchlights swept the park which was sealed off.直升飞机的探照灯来回扫射这个被封锁的公园。Police and troops sealed off the area after the attack.袭击发生后警察和士兵将该区域封锁。...
Visual position measurements in astrometry are most affected.天体测量学中视位置的测量受影响最大.A new theoretical system of astrometry in the frame of relativity ought to be finished.天体测量学需要在相对论框架下重新建立自己的理论体系.In this paper, the present s...
Many people were dependent for their water supply on this pestilential stream.许多人靠这条水质受污、可致疫病的河流来取水。As Jefferson said, cities are pestilential to the morals , the health, and the liberties of man.如杰斐逊所言, 城市“毒害了人类的精神 、 体和...
He umpired baseball games.他担任棒球比赛的裁判。He umpired in the tennis match.他在网球比赛中担任裁判.I’ve umpired a cricket match for them.我当过他们的板球比赛的裁判。He umpired for school football matches until he was in his late 50s.他担任校际足球比赛的裁判一直到年近花甲。...
The trains and subways in Tokyo serve thousands of commuters everday.东京的火车和地铁每天都接送成千上万的人上下班.Subways are really crowded at rush hour.高峰时刻,地铁一定很拥挤吧.The city subways carry hundreds of thousands of passengers a day.市内的地下铁每天运...