慢速英语:Earth’s Continents and Ocean Floors Are Always Moving
日期:2011-01-04
1.motion n.(物体的)运动，移动，动
例句：The object is no longer in cyclical motion.
这物体已不再循环运动。
2.crack vt.vi.(使…)开裂, 破裂
例句：But at last the shells cracked, one after another.
最后, 蛋壳一个接着一个地裂开了。
3.underwater adj.水面下的;水下使用的;水下进行的
例句：The ship was underwater when they reached her.
他们赶到那艘船时, 船已沉到水里了。
4.split vt.vi.(使)裂开; (使)破裂
例句：The wood splits easily.
这木头容易劈开。
His coat has split open at the seams.
他的外套在接缝处裂开。