n.伸展；擴大；延長部分；電話分機

名詞extension的復數(shù)形式.

Your back exercises should include lat pull-downs and back extensions. 背部的練習應包括前曲和后背伸展。

These temporary hive extensions contain frames of empty comb for the bees to fill with honey. 這些臨時的蜂箱擴大了能包含為蜜蜂準備的空巢結構去存蜜。

There are telephone extensions in every office. 每間辦公室都有電話分機。