渤澥桑田

1. • lit. blue seas where once was mulberry fields (idiom, from 史记 shǐjì, Record of the Grand Historian) time brings great changes
2. • life's vicissitudes

Character by character

• 渤(bó)
• 澥(xiè)become watery
• 桑(sāng)surname Sang
• 田(tián)surname Tian