不可缺少
word- indispensable
From the library
现金曾经是人们日常生活中不可缺少的一部分。
如今,点外卖已经成为许多人生活中不可缺少的一部分。
慢慢地,音乐成为了他们日常生活中不可缺少的一部分。
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