noun 下载 🔗分享 檐口，反檐. The upturned edge of a roof which acts as a gutter; a cyma. Examples : "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。 architecture building 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. Examples : "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。 geology material substance world science nature 与AI对话词汇游戏阅读练习
