不變
buˊ bianˋ
Unchanged, Not changed
一成不變
Fixed, Invariable, Immutable
yiˋ chengˊ buˊ bianˋ
正方形面積不變
The area of the square is still the same, The area of the square hasn't changed
zhengˋ fang¯ xingˊ mianˋ ji¯ buˊ bianˋ
一不變的
Unchanging, Constant
yiˋ buˊ bianˋ de˙
是不變的
Is constant, Is unchanged
shiˋ buˊ bianˋ de˙
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