他的背包塞得太满,拉链都快撑开了。

His backpack was bulging so much that the zipper could barely close.

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His backpack was bulging so much that the zipper could barely close.

bulging 是动词 bulge 的现在分词形式。bulge 的意思是"膨胀、鼓起",形容物体因内部装满东西而向外凸起的样子。这里描述背包被塞得太满而鼓胀的状态。

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