He looks as if he's about to make a drumroll in the air with his fingers.

他看上去想用手指在空中打一通鼓点，但他看看外国孕妇后，暗自决定这不是个好主意。

Harry stared out toward the lake, his heart doing a kind of drumroll in his chest....

哈利向湖面看，心脏在胸膛里跳得和擂鼓一样。

Gravity gets weaker with distance, so–being a bit farther from the center of the Earth plus that small centrifugal pull makes gravity at the equator about...drumroll please...0.5% weaker than at the poles.

距离越远，重力越弱，所以离地心稍微远一点加上微微往上的推力......请给我鼓声......在赤道上的重力会比南北极弱约0.5%。