The electron microscope uses a beam of electrons to produce images at high magnifications.电子显微镜利用电子束形成高倍影像。And what is more: The technique can be used with all objective magnifications is no restriction.特别提示: 这种技术能适用于各种物...
She was just 14 when she caused a sensation at the Montreal Olympics.她在蒙特利尔奥运会上引起轰动时才 14 岁。...the Montreal Protocol to phase out use and production of CFCs...逐步停止使用及生产含氯氟烃的《蒙特利尔议定书》Today on the streets of Montreal, opini...
The boy remained as dismal as a hearse.那孩子仍然看上去像口棺材,死气沉沉.It was a big black battered hearse -- like automobile . There were three men in it.那是一辆破旧不堪的黑色大车,活象一辆柩车. 车里坐着三个人.I need a hearse at Vera Smith's house.我需要一辆灵车...