belt highway短语¹¹⁴⁴⁶⁷⁺⁴ 基本例句 美环路; 环形公路 The concentrations of N and S in Sabina chinensis leaf were higher along urban trunk roads and belt highway than at reference site, while those along suburban roads were similar to the reference. 城市干线和绕城公路蜀桧叶片中的 N和 S含量高于对照点，而城郊公路则接近对照。 cnki