Activity test
[化] 活性试验; 催化剂的活性试验
🧩 词语组成解析
🗣️ 情景例句
She majored in math and physics at university.
她在大学里主修数学和物理。
He has a sweeter.
他有一件毛衣。
In the play, she must appear in a bright red dress and long black stockings.
演出时她必须穿一条鲜红色的裙子和黑色的长筒袜。