1. 可交换的;可互换的;可交替的
Things that are interchangeable can be exchanged with each other without it making any difference.

1. capable of replacing or changing places with something else
permitting mutual substitution without loss of function or suitability

e.g. interchangeable electric outletsinterchangeable parts

Synonym: exchangeablesimilarstandardizedstandardised

2. (mathematics, logic) such that the arguments or roles can be interchanged

e.g. the arguments of the symmetric relation, `is a sister of,' are interchangeable