If one thing is indistinguishable from another, the two things are so similar that it is difficult to know which is which.
例句
Replica weapons are indistinguishable from the real thing.仿真武器与真武器很难区分。
英汉词典释义
adj.
难区分的,不能分辨的
indistinguishable twins难区分的双胞胎
英英词典释义
Adjective
1. exactly alike; incapable of being perceived as different;
"rows of identical houses""cars identical except for their license plates""they wore indistinguishable hats"
2. not capable of being distinguished or differentiated;
"the two specimens are actually different from each other but the differences are almost indistinguishable""the twins were indistinguishable""a colorless person quite indistinguishable from the colorless mass of humanity"