扬子克拉通北缘早前寒武纪地壳演化&后河杂岩元素和同位素地球化学限制
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物流成本高、流通效率低、产品损耗严重这些因素严重制约着现代农产品的流通。
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The constitution should not constrain us from articulating these political ideas.
宪法不应阻止我们声张这些政治理念.
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As with dragging, a meta-key is often used to constrain the direction of a resize interaction.
和拖动一样, 元键在这里也可以用来约束调整尺寸操作的方向.
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