名词
中文翻译：上部保护层
同义词：
['uppermost layer', 'uppermost protection例句：1. The engineers were working on the upper sheathing to ensure its strength.（工程师们正在工作，以确保上部保护层的强度。）']
例句：
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1. The engineers were working on the upper sheathing to ensure its strength.
工程师们正在工作，以确保上部保护层的强度。
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2. The construction of the bridge required the use of upper sheathing to prevent water infiltration.
建造桥梁需要使用上部保护层，以防止水分渗透。
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3. The upper sheathing was designed to withstand high winds and heavy rain.
上部保护层被设计成能够承受强风和大雨。