雄关的英文：
impregnable pass

• To saturate; impregnate.
  使饱合;使充满.
• She impregnated with viscid isolation impregnation substance
  她用粘性绝缘物质浸渍。
• treated, coated, or impregnated with rubber.
  用橡胶处理，涂上或注入橡胶。
• The air of this room is impregnated with damp.
  这房间充满着湿气。
• To saturate, impregnate, or coat with paraffin.
  用石蜡使充满、使饱和或涂抹

• This coin will not pass.
  这钱币不通用。
• pass a messenger
  传递引绳
• The evening passed as evenings mostly pass at Italian theatres
  那一声过得很平淡，象意大利戏院里的大多数夜晚一样
• Jan has passed the ball to the teammate, a wonderful pass.
  简把球传给了队友，传得可真漂亮。
• You could pass for a teenager. The fake painting passed for an original.
  你可冒充十几岁的人。这幅伪造的画被当作真品