non-replaceable ; cannot replace
不可替换的输血费 non-replacement charge
不可换性替代 noncommutativity of substitution
想要不可替换，就必需不同凡响。
Want can not be replaced, it must be not of the common sort.
youdao
证书不可替换。
The Certificates are not replaceable.
在有合适报价的情况下并非不可替换，最好的考虑还是出售他。
Hes not irreplaceable though and if you get a good enough bid, best advise would be to consider moving him on.
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