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歩道， ほどう

1. footpath, walkway, sidewalk, pavement

人行道、走道、人行步道

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陥没， かんぼつ

1. cave-in, collapse, sinking, depression (e.g. of the skull), subsidence

坍塌、崩塌、下沉、下陷；凹陷(例如颅骨的凹陷)

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