缺一不可
- na.integral
- 网络Dispensable; book; All of these are necessary

缺一不可
1.Not a single one can be omitted.; integral; None can be dispensed with [excluded].; None is dispensable.; Not one of them can be dispensed with.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29