单词：platemarks
证明金银等纯度的印记
【印刷】印版留下的压痕
vt.
=hallmark
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The theory of plate tectonics describes the motions of the lithosphere, the comparatively rigid outer layer of the Earth that includes all the crust and part of the underlying mantle. The lithosphere(n.[地]岩石圈)is divided into a few dozen plates o
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