例句與造句

1. "' Cholane "'is a triterpene which can exist as either of two stereoisomers, 5?-cholane and 5?-cholane.
2. "' Cholane "'is a triterpene which can exist as either of two stereoisomers, 5?-cholane and 5?-cholane.
3. "' Cholane "'is a triterpene which can exist as either of two stereoisomers, 5?-cholane and 5?-cholane.
4. It's difficult to find cholane in a sentence. 用cholane造句挺難的