第一个笔槽放置你的笔书写工具。
稳固的底座，指示角度以及笔屑槽都被融合成为一个简单的整体。
The stabilizing feet, guiding angle, and collection bowl were all integrated into one simple unit.
国内外海相大油气田的烃源岩均为粘土矿物含量较高的笔石页岩、油页岩和泥灰岩，形成于由台地向海槽过渡的深水斜坡环境。
High content clay mineral shale, oil shale and marlite are the main source rocks for large oil or gas fields in the world, which formed in deep water slopes between platform and open sea.
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