賴氨酸

lysine (Lys), an essential amino acid

sour / tart / sick at heart / grieved / sore / aching / pedantic / impractical / to make sarcastic remarks about sb / an acid

ammonia

surname Lai

to depend on / to hang on in a place / bad / to renege (on promise) / to disclaim / to rat (on debts) / rascally / to blame / to put the blame on