Ethylethylene
丁烯-1
🗣️ 情景例句
He's teething.
他正在长牙齿。
May I have a receipt?
我可以要一张收据吗？
Working rapidly in the darkness, he soon changed into the dead man's clothes.
他在黑暗中忙活了一阵儿，很快就换上了死者的衣服。