他的背包塞得太满,侧面都鼓起来了。

His backpack was so full that the sides were bulging.

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His backpack was so full that the sides were bulging.

bulging 是动词 bulge 的现在分词形式,bulge 的意思是"膨胀、鼓起",指物体因内部压力而向外凸起。

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