wall opening

基本解释

Badaling Great Wall is located in the south of Yanqing County, 70 km away from Beijing city. It is the first section of the Great Wall opening to public.
八达岭长城位于延庆县城南部，距北京市中心70公里，是开放最早的一段长城。
www.coohotel.com.cn
CAUTION: The controller is not free standing! The controller must be secured to the floor or wall before opening door or operating.
注意：控制装置并不会直立不动！在开门或操作之前，务必要将控制装置安全固定在地面或墙上。
Strain analyzing shows that the ending columns and connecting beams play a more important role in the wall with opening.
钢筋应变分析表明外框柱、连梁对开洞墙体的受力性能贡献较大；

Plus could not fit through their rock-wall opening.
NEWYORKER: Tenth of December
It was trading relatively flat in the pre-market hours, with one hour to go before the opening bell on Wall Street.
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Wall Street rallied from the opening bell Tuesday and never looked back.
FORBES