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...
The Baptistery is a stately rotunda, of huge dimensions, and was a costly structure.浸礼堂, 是个面积巨大的圆厅, 也是座豪华的建筑.The belief that the Baptistery originated a Roman Temple of Mars persisted for centuries.洗礼堂起源于作为战神马尔斯的罗马寺庙的信念持...
沙丁鱼是生活在海中的小鱼。Pilchards are small fish that live in the sea海豹和鲸鱼是海中的动物.Seals and whales are marine animals.我们常在电视中见到海中的立标.We often see pharos on the sea in TV....