硅铝层,大陆壳。
例子:
"Geologists study the composition of sial to understand the formation of continents. "
地质学家研究**硅铝层(大陆壳)**的组成,以了解大陆的形成。

"Geologists study the composition of sial to understand the formation of continents. "
地质学家研究**硅铝层(大陆壳)**的组成,以了解大陆的形成。