- the soft part of an animal on the underside of its body（动物的）下腹部，腩Topics Animalsc2
- the weakest part of something that is most easily attacked脆弱点；薄弱环节
- The trade deficit remains the soft underbelly of the US economy.贸易赤字仍是美国经济的软肋。🔊🔊
- an unpleasant or criminal part of society that is usually hidden脆弱点；薄弱环节
- He became familiar with the dark underbelly of life in the city.他逐渐熟悉都市生活的阴暗面。🔊🔊