extension
/ɪkˈstɛnʃən/
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n. 延長；擴建；分機
- Hikers welcomed the extension of the trail, which now reaches a hidden waterfall. 登山客很歡迎步道延長，現在可以一路走到一座隱密的瀑布。
其他意思
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n. 延長, 擴充, 分機, 副檔名
An extension is a new room or building which is added to an existing building or group of buildings.
也出現在：
字根
tend, tens, tent 伸展
ex + tens + ion向外、出來 + 伸展 + 名詞