Polyacetylen
聚乙炔; 聚乙炔
🗣️ 情景例句
Hi, Mr. Stewart.
嗨， Stewart先生。
We prepared a picnic lunch and drove down by the river.
我们准备了野餐午餐并沿河边向下开车。
The dogs have greater freedom, too, for they are allowed to wander outside their enclosure.
狗也比较自由，被放出围栏，四处遛达。