- 释义：
- n. (正)门; 隧道; 门; 入口
- 例句：
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She knew that silent , motionless portal opened into the street.
她知道这扇静止不动的门直通街上.
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The portal frames are joined at the top by a cross member.
在门形框架顶部使用一个横撑相连.
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The cirrhotic process obstructs the intrahepatic portion of the portal venous system.
肝硬化使门脉系统的肝内部分受阻.
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