蒸汽机车启动时发出噗噗的声音。

The steam engine ___chuffed as it started moving.

老旧的小火车噗噗地沿着铁轨前进。

The old little train ___chuffed along the tracks.

孩子们收到新玩具时开心极了。

The kids were really ___chuffed when they got new toys.