【HP】原著精读 哈利波特与魔法石 笔记1-6(9)

A low rumbling sound had broken the silence around them. It grew steadily louder as they looked up and down the street for some sign of a headlight; it swelled to a roar as they both looked up at the sky – and a huge motorbike fell out of the air and landed on the road in front of them.
l Grudgingly

reluctantly or unwillingly,not generously or with a good will
"He tried to evade the work and responsibility until the very last moment and then grudgingly,finally,exasperatingly did his job."
l Swell
1.to increase gradully in volume or intensity,as sound "The music swelled."