noun下载🔗分享檐口,反檐. The upturned edge of a roof which acts as a gutter; a cyma.例子:"The rain poured off the roof and into the sima, preventing water from dripping directly onto the porch. "雨水从屋顶倾泻而下,流入反檐,防止水直接滴到门廊上。architecturebuilding与AI对话词汇游戏阅读练习
noun下载🔗分享硅镁层, 镁铁层 The lower layer of the earth's outer crust that underlies the sial and is rich in silica, iron, and magnesium.例子:"Geologists explain that the sima, rich in magnesium and iron, lies beneath the continents' less dense sial layer. "地质学家解释说,富含镁和铁的镁铁层 (sima) 位于大陆地壳密度较低的硅铝层 (sial) 之下。geologymaterialsubstanceworldsciencenature与AI对话词汇游戏阅读练习