Polymer catalyst
[化] 高分子催化剂
🧩 词语组成解析
🗣️ 情景例句
It's an album of pictures of the United States:
是关于美国的
It's two o'clock.
现在两点。
They were still neck and neck! But the other runners were not far behind.
他们仍在肩并肩地跑！但是，其他运动员也距离他们不远。