The noun 氨基酸 (ānjīsuān) means "amino acid," which refers to the organic compounds that serve as the building blocks of proteins. It is a scientific term commonly encountered in biology and chemistry contexts. For example, 多种氨基酸 means "many types of amino acids."
鸡蛋含有丰富的氨基酸。
jīdàn hányǒu fēngfù de ānjīsuān.
Eggs are rich in amino acids.
人体需要多种氨基酸来维持健康。
réntǐ xūyào duō zhǒng ānjīsuān lái wéichí jiànkāng.
The human body needs various amino acids to maintain health.
这种食物里含有八种必需氨基酸。
zhè zhǒng shíwù lǐ hányǒu bā zhǒng bìxū ānjīsuān.
This food contains eight essential amino acids.