可有可无
- na.not essential; not indispensable
- 网络nice to have; nonessential; Not indispensable

可有可无
1.not essential; not indispensable; may or may not be needed; be as well without it as with it
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
20
21
22
23
24
25
28
29