I saw him puzzle over a math problem.
我看见他正在苦心思索一道数学题。
However, doctors continue to puzzle over handedness.
但是，医生们仍然为用手习惯感到不解。
A building is just a small piece of a large puzzle that has grown over the centuries.
建筑也只不过是几个世纪大难题的一小部分。
A building is just a small piece of a large puzzle that has grown over the centuries.
建筑也只不过是几个世纪大难题的一小部分。
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