脑细胞储存记忆的机制至今尚未明了。
The mechanism by which brain cells store memories is not clearly understood.
到二十世纪中叶，美国的画家和雕塑家们就已经开始对艺术界施加世界性的重大影响。
By the middle of twentieth century, painters and sculptures in the United States had begun to exert a great worldwide influence over art.
伊丽莎白市坐落在新泽西州东部，是重要的船运和制造业中心。
In the eastern part of New Jersey lies the city of Elizabeth, a major shipping and manufacturing center.
