Previtamin a
[医] 前维生素A, 胡萝卜素
🧩 词语组成解析
维生素原, 前维生素
🗣️ 情景例句
Would Ms Lin please come forward?
有请林小姐到前面来。
You'll solve the problem if you concentrate upon it.
如果全神贯注，你就会解决这个问题。
In the class there are two American girls. They are twins. Their names are Lily and Lucy.
在班上有两个美国女孩，他们是双胞胎，名字叫鲁茜、莉莉。