以物易物

rén men hěn kuài jiù shú liàn de zài shì chǎng shang yǐ wù yì wù

人们很快就熟练地在市场上以物易物。

People soon became adept at bartering in the market.

dǎo shang de jū mín shí xíng de shì yǐ wù yì wù ér bù shì yòng huò bì

岛上的居民实行的是以物易物，而不是用货币。

The islanders use a system of barter instead of money.