封闭连接是指将相邻上皮细胞的质膜紧密连接在一起，阻止溶液中的小分子沿细胞间隙从细胞一侧渗透到另一侧。
一道楼梯和一台电梯连接两层楼和封闭的屋顶平台。
Both a staircase and a lift connect the two floors with an enclosed terrace on the roof.
网络为任何一个有键盘和网络连接的人打开了职业编辑和新M记者的封闭世界。
The web has opened the closed world of professional editors and reporters to anyone with a keyboard and an internet connection.
他说：“到1万5千5百年前的时候，陆地上连接阿拉斯加和美洲大陆的无冰通道封闭了，这两片冰层已经相接。”
By 15,500 years ago, the ice-free corridor, that land corridor connecting Alaska with the mainland of the United States, was closed. The two ice sheets had merged.
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