渤澥,渤海的古称。大海变成桑田,桑田变成大海。犹沧海桑田。比喻世事变化巨大。
lit. blue seas where once was mulberry fields (idiom, from 史记, Record of the Grand Historian); time brings great changes; life's vicissitudes
渤(bó)
澥(xiè)
桑(sāng)
田(tián)