正常的双螺旋DNA是螺旋形的, 像一根松松地卷曲的弹簧.Normal, double - helix DNA is spiral, like a loosely coiled spring.这就是双螺旋.This is the double helix.由此产生的双螺旋结构减少了摩擦,并允许更快, 更容易系带.The resulting double helix reduces friction and allows faster, e...
He is making a bid to regain his World No. 1 ranking.他正为重登世界排名第一位而努力。Agassi was playing well above his world ranking of 12.阿加西的比赛表现大大超出了他在世界上第12位的排名。...social gaffes committed by high-ranking individuals.高层人士在社交场合的一些失态行为...