(as) deep as a well

• 莫测高深的；难以捉摸的

(as) deep as a well的用法和样例：

例句

1. She is a very erratic tennis player.
   她是个极其难以捉摸的网球手。
2. His eyes gleamed with a smart, evasive light.
   他那对眼睛闪耀着一种灵活的难以捉摸的光芒。