Polyacetylenes
多炔
🗣️ 情景例句
The children's performances brought down the house.
孩子们的演出博得满场喝彩。
He is a good friend that speaks well of us behind our backs.
背后说人好话的够朋友。
The most economical age to capture an elephant for training is between fifteen and twenty years,
捕捉15至20岁之间年龄的大象进行驯练最为经济。