extensions [ɪks'tenʃnz]

以下由轻松背单词网站提供

附加级

n.延长( extension的名词复数 )；延伸；[逻辑学] 外延；扩展名

There are telephone extensions in every room. 每个房间都有电话分机。来自《简明英汉词典》
What are extensions and where do I download them? 什么是extensions扩展？哪里可以下载扩展？来自互联网