Butene
n. [化]丁烯
🗣️ 情景例句
OK.
好的。
She's engaged married to John.
她和约翰订婚 结婚了。
As soon as he opens the gate from the outside, he comes into the garden and waits until the gate shuts.
它从外面把门一打开，就走进花园，等着门自动关上。