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她满面愁容，不知有何心事。(on one's mind)

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他是个害羞和沉静的男孩，在走上讲台叙述自己的经历之前，他悄悄地坐在礼堂的一角集思冥想。（gather one's thoughts）

直线和平面的位置关系有哪些？

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