so surprising that it is difficult to believe 令人震惊的；使大吃一惊的 There was an astounding 20 per cent increase in sales. 销售额增长了惊人的20％。 The performance was an astounding success. 表演取得了惊人的成功。 They can perform astounding mathematical feats in seconds. 他们可以在几秒钟内完成惊人的数学壮举。