等價交換

equal-value exchange

class / rank / grade / equal to / same as / to wait for / to await / et cetera / and so on / et al. (and other authors) / after / as soon as / once

equal / equal in value / equivalent

price / value / (chemistry) valence

great / good / middleman / servant

to hand over / to deliver / to pay (money) / to turn over / to make friends / to intersect (lines) / variant of 跤[jiao1]

to exchange / to swap / to switch (telecom) / commutative (math) / to commute

to exchange / to change (clothes etc) / to substitute / to switch / to convert (currency)

exchange of unequal values