以下为句子列表：
英文: Among the new elements of the site released Thursday were the Memorial Hall, a 1.5-acre clearing at ground level for public gatherings, and the exposed stumps of columns that supported the twin towers.
中文: 周四公开发布的新的设计包括纪念馆，与地面齐平的1.5英亩的空地（作为公共集会区），还有暴露在地面上的支撑双塔的残余柱桩。
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英文: An underground defensive position with a fortified projection above ground level for gun emplacements.
中文: 掩蔽壕，地堡一个地下防御工事，有一个高干地面的，用来放枪的防御射击处
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英文: At ground level ozone is a dangerous pollutant, but at altitude it blocks the passage of harmful ultraviolet light.
中文: 臭氧在地表是一种有害气体，但在高空它阻挡有害的紫外光。
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英文: Coppice (copse) A woodland managed for wood production by cutting trees back to ground level at regular intervals (usually 10-15 years) and allowing adventitious shoots to grow up from the base.
中文: 萌生林（杂树林）：在森林更新作业中，由树木的定期伐桩（通常是10－15年）和根萌蘖而形成的森林。
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英文: If an installation requires below ground level installation, a modified pit installation is recommended, as well as the approval of local codes.
中文: 如果要求在地面以下安装，则建议在当地规程的批准下改进坑内安装。
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