However, doctors continue to puzzle over handedness.

但是，医生们仍然为用手习惯感到不解。

youdao

I saw him puzzle over a math problem.

我看见他正在苦心思索一道数学题。

youdao

I saw him puzzle over a math problem.

我看见他正在苦心思索一道数学题。

youdao