After the new policy was announced, the government received an avalanche of public feedback.

avalanche 原指"雪崩"，这里用作比喻，形容数量巨大、来势凶猛的事物。就像雪崩时大量积雪突然倾泻而下一样，这里形容公众反馈如雪崩般大量涌来。