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1.露天的墙顶上用砖﹑瓦等筑成的覆盖层。
(1) [the sky was covered with dark clouds]∶由头顶上面压下来,多用于比喻 乌云压顶 (2) [house top]∶露天的墙顶上用砖瓦等筑成的覆盖层
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