Meaning of sī:
sī
丝
Noun
silk; thread-like thing; (cuisine) shreds or julienne strips
Zhè tiáo wéijīn shì yòng chún sī zhìchéng de.
这条围巾是用纯丝制成的。
This scarf is made from pure silk.
Chúshī bǎ húluóbo qiè chéng xìxì de sī.
厨师把胡萝卜切成细细的丝。
The chef cut the carrots into fine shreds.
Measure Word
classifier: a trace (of smoke etc), a tiny bit etc
Zài kōngqì zhōng, wǒ kàn dàole yī sī yānwù.
在空气中，我看到了一丝烟雾。
In the air, I saw a trace of smoke.
