化學需氧量 Save Create a free account to save words Simplified: 化学需氧量 huàxuéxūyǎngliàng ㄏㄨㄚˋ ㄒㄩㄝˊ ㄒㄩ ㄧㄤˇ ㄌㄧㄤˋ chemical oxygen demand COD environmental science Character by character 化(huà)make into 學(xué)learn 需(xū)require 氧(yǎng)oxygen 量(liàng)capacity Sign up for a free account to save words and review them A Chinese word or character, or English Search Sources CC-CEDICT, CC BY-SA 4.0 pinyinjs, Apache-2.0