那个肌肉男连简单的数学题都不会做，真是个四肢发达头脑简单的家伙。

That ___muscle-head can't even solve simple math problems - all brawn and no brain.

那个肌肉男只会用蛮力解决问题，从不动脑筋。

That ___muscle-head always uses brute force instead of thinking.