a mind like a steel trap
A mind capable of understanding or grasping information quickly. David has a mind like a steel trap, so if you give him the instructions, he'll follow them perfectly. My grandmother is nearly 96 years old, but she still has a mind like a steel trap. Shoot, she remembers things better than me most of the time! Molly has a mind like a steel trap, so go ask her—she'll probably remember.
have a mind like a steel trap
To be able to understand or grasp information quickly. David has a mind like a steel trap, so if you give him the instructions, he'll follow them perfectly. My grandmother became very physically incapacitated as she grew older, but she had a mind like a steel trap until the day she died. Is he really pulling a door that's clearly marked "push"? He doesn't exactly have a mind like a steel trap, does he?
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