underbelly
n. 下腹部；薄弱部分；易受攻击的部位、区域等
复数 underbellies
例句
The missiles emerge from the underbelly of the transport plane.
导弹从运输机的腹部发出。
《柯林斯英汉双解大词典》
The trade deficit remains the soft underbelly of the US economy.
贸易赤字仍是美国经济的软肋。
《牛津词典》
I know where his soft underbelly is, and that's his material possessions.
我知道他的弱点是什么，是他的财产。
