beltway
/ˈbeltweɪ/noun
1- US a ring road〈美〉环形公路, 环线。
1.1
Beltway
often as modifier Washington DC, especially as representing the perceived insularity of the US government“环形路”（指美国首都华盛顿, 因围绕华盛顿的环形公路而得名, 喻美国政府的封闭性）：conventional Beltway wisdom.
美国政府因循守旧的见解。
ORIGIN: transferred use by association with the ring road encircling Washington.