阪上走丸如丸走坂bǎn shàng zǒu wánballs roll rapidly down a slope—a rapidly developing situation; do sth most easily; ride the crest of fortune
❍ 战争爆发后，形势急转直下，犹如～。After the war broke out,the situation took a sudden turn and developed rapidly like a ball rolling down a slope. 阪上走丸bǎn shàn zǒu wán形容形势发展很快，如同斜坡上滚弹丸一样。the situation goes faster and faster, just like rolling a ball down the slope |