un·der·bel·ly
noun/ˈʌndəbeli/
/ˈʌndərbeli/
[singular]- the soft part of an animal on the underside of its body
（动物的）下腹部，腩 - 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。
- The trade deficit remains the soft underbelly of the US economy.
- an unpleasant or criminal part of society that is usually hidden
（社会的）阴暗面，底层 - 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。
- He became familiar with the dark underbelly of life in the city.