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| English | Chinese |
| open habitat | 开阔生境 |
| open lawn Any relatively unobstructed field of cultivated and mown grass, especially near a house or in a park | 开放草坪 (任何相对通畅的栽植和已割的草地区域，特别是靠近居民住房或者在一个公园里。) |
| open sea | 公〔大〕海 |
| open sea The high seas lying outside the exclusive economic zones of states. All states have equal rights to navigate, to overfly, to lay submarine cables, to construct artificial islands, to fish, and to conduct scientific research within the high seas | 公海 (超出了国家专属经济区的外海。所有国家都有平等的权利去航行、飞越、铺设海底电缆、建设人工岛屿、捕鱼，并可在公海进行科研。) |
| open sea fishing Fishing in the deepest parts of the sea | 远海捕鱼 (在海洋最纵深处捕鱼。) |
| worked-out open cut A mine where all the mineral that could be profitably exploited has been removed | 露天空矿 (所有的可被利用开采的矿产已被清除的一种矿井。) |