🧩 词语组成解析
walker
['wɔ:kə]
n. 散步的人;（帮助小孩学走路用的）学步车;助步车;助行架;
n. 珀西（男子名）
🗣️ 情景例句
You're right. Of course.
说得也是。
We never know the worth (or value) of water till the well is dry.
井枯方知水可贵。
The geologist needs to know what rocks the drill has reached,
地质学家需要知道钻头已经到达什么样的岩层，