I was no longer disturbed by the persistent whump whump whump of the police helicopter overhead.

我不再被头顶上警用直升机持续不断的扑通扑通的声音打扰了。

He was almost to the cane when it rattled all about him and there was a heavy whump and then the echo of it from across the river.

他快要碰到拐杖时， 拐杖在他周围嘎嘎作响， 发出一声沉重的撞击声， 然后从河对岸传来回声。