Polyacetylen
聚乙炔; 聚乙炔
🗣️ 情景例句
you have so much energy and so many years of experience.
你精力这么好 ，又有这么多年的经验。
Self-trust is the first secret of success.
自信是成功的首要秘诀。
Where's Pamela?
帕梅拉在哪儿？