boundary /'baʊnd(ə)rɪ/ n. 邊界;界限;分界線:點擊收聽音頻跟讀 ↓↓↓ ↓↓↓ ↓↓↓
national boundaries
國界
英語解釋:a real or imagined line that marks the limits or edges of sth and separates it from other things or places; a dividing line 邊界;界限;分界線:
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