external collision 外在冲击
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The utility model is convenient in use, the erasing head doesn't fall out easily, and the liquid in the bottle can not overflow because of external pressure extrusion, collision or inverted placement.
该产品的优点为使用简便，擦头不易脱落，容器内液体不会受外力挤压或碰撞或倒置而溢出。
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