甘心如荠

Explanation: Water chestnut: beet. Tea has a bitter dish, but compared to the pain and heart, I feel as sweet as shepherd's purse. 　　Source: "Book of Bei Feng Valley Wind": "Who is that the tea bitter? The willing, such as water chestnut. Feast of new faint Seoul, Ruxiong such as the younger brother." 　　Examples: For the country, even their lives, but also ~. Thesaurus:  Gan, such as water chestnut