| 丝 |
sī ān suān | serine (Ser), an amino acid |
| 丝 |
sī | silk / thread-like thing; (cuisine) shreds or julienne strips / classifier: a trace (of smoke etc), a tiny bit etc |
| 氨 |
ān | ammonia |
| 酸 |
suān | sour / tart / sick at heart / grieved / sore / aching / pedantic / impractical / to make sarcastic remarks about sb / an acid |