Well, start with the three carbon chain, because of that prop, and count out the carbons, 1-2-3.

好吧，从三碳链开始， 因为那个支柱，数出碳，1-2-3。

Can you build it? Well, start with the three carbon chain, because of that prop, and count out the carbons, 1-2-3.

你能建造它吗？ 好吧，从三碳链开始， 因为那个支柱， 数出碳，1-2-3。