dispensable /dɪˈspensəbl/
adj.
[not usually before noun] 不必要；可有可无；不重要
not necessary; that can be got rid of
They looked on music and art lessons as dispensable.
他们认为音乐课和美术课是可有可无的。
All those people in the middle are dispensable.
所有那些立场骑墙的人都可要可不要。
indispensable /ˌɪndɪˈspensəbl/
adj.
~ (to sb/sth) | ~ (for sth/for doing sth)
不可或缺的；必不可少的
too important to be without
同义词： essential
Cars have become an indispensable part of our lives.
汽车已成了我们生活中必不可少的一部分。
She made herself indispensable to the department.
她成为这个部门不可缺少的一分子。
A good dictionary is indispensable for learning a foreign language.
一本好词典是学习外语必备的。
点点关注，谢谢喵~
