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单词 sima
释义

Definition of sima in English:

sima

nounˈsʌɪməˈsaɪmə
mass nounGeology dated

  • The material of the lower part of the earth's crust, underlying both the ocean and the continents, characterized as relatively heavy and rich in silica and magnesia.

    〔地质〕硅镁层，硅镁带。比较SIAL

    Contrasted with sial
    Example sentencesExamples
    • The sial and sima both form the earth's crust which varies in thickness.

Origin

Early 20th century: blend of silica + magnesium.

Definition of sima in US English:

sima

nounˈsīməˈsaɪmə
Geology dated

  • The material of the lower part of the earth's crust, underlying both the ocean and the continents, characterized as relatively dense and rich in silica and magnesia.

    〔地质〕硅镁层，硅镁带。比较SIAL

    Contrasted with sial
    Example sentencesExamples
    • The sial and sima both form the earth's crust which varies in thickness.

Origin

Early 20th century: blend of silica + magnesium.
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更新时间：2025/7/17 20:40:00