正电子发射断层成像 ( PET ) 是一种结合单一分子放射示踪的成像技术.Positron emission tomography ( PET ) is an imaging technique that combines a radioactive tracer with a molecule....
It was the kind of rumour that it is impossible to refute.这是那种让人根本没法批驳的谣言。It goes without saying that we have the right to refute them publicly.不用说我们有权公开驳斥他们.The meeting was very lively and informal with everyone chippin...
Watch out for bargains, but never buy dented cans.留意便宜货，但绝不要买表面凹陷的罐头。Early birds can get the best bargains in the January sales.动作快的人能够在1月份的打折中淘到最便宜的东西。I picked up a few good bargains in the sale.我在减价期间买了几样挺不错的便宜货。...
Yet few world-class rivers anywhere have etched a more enduring impression on as many millions for as many years.然而,世界上很少有这样大的河流会给这样多的人留下这样长时间的令人难忘的印象。...the enduring fundamental principles of life that ennoble mankind.使...
河流转向东流时河道大幅度变宽。The river widens considerably as it begins to turn east.这些小山碧绿陡峭，矗立在这条宽阔的河流之上。The hills rise green and sheer above the broad river.我们在群山、河流和葡萄园构成的美丽画卷中漫步。We meandered through a landscape of mountains, rive...