When the plastic or foil is cut, however, air gets in, equalising the pressure. The coffee then acts like the pile of particles it is, and the brick can change shape.
当塑料袋或铝箔被打开，空气进入，平衡了压力，然后咖啡会像一盘散沙，使得咖啡砖可以变换形状。
Dr Jones says the phenomenon is much like that observed in a vacuum-packed coffee brick.
Jones博士说这种现象类似观察真空包装的咖啡袋。
Dr Jones says the phenomenon is much like that observed in a vacuum-packed coffee brick.
Jones博士说这种现象类似观察真空包装的咖啡袋。
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