Sillimanite
n. 硅线石\\n[化] 硅线石
🗣️ 情景例句
I heard that some tours actually go down into the canyon. Is that true?
我听说有的旅游团真正下到峡谷里去了。那是真的吗？
It's hard to say.
很难说。
How long has Jim been at his school?
吉姆到校有多长时间了？