4. 七環
the 7th Ring Road

請看例句：

A 1,000-km expressway linking Beijing and nearby cities in Hebei province was completed on Tuesday. As Beijing already has six ring-roads within the city, the public has been calling the new expressway "the 7th Ring Road".
一條長1000公里、連接北京和河北省多個臨近北京的城市的高速公路6日貫通。由于北京市內已有六條環路，公眾把這條新高速公路稱為"七環"。

起自北京市密云區、終至河北省涿州市的密涿高速公路(Miyun-Zhuozhou Expressway)的建成，標志著"北京大外環"(the Great Beijing Outer Ring Road)正式合環。"北京大外環"俗稱"七環"(the 7th Ring Road)，是京津冀交通一體化方案(Beijing-Tianjin-Hebei transportation integration plan)的一部分，目的是通過高鐵(high-speed rail)和高速公路(expressway, highway)加強北京和鄰省之間的聯系。

密涿高速的建成能使北京東南部現有的過境交通(transit traffic)，尤其是貨運過境交通(transit traffic of cargo trucks)，逐漸轉移至北京外圍地區(periphery of Beijing)，對于緩解交通擁堵(ease traffic congestion)有重要意義。此外，密涿高速公路還是一條"機場路"。新機場建成后，這條高速將成為溝通北京兩座機場間最便捷的道路(become the most convenient way to get between the two airports in Beijing)。

[相關詞匯]

環路高速公路 ring-road expressway

路網 road network

過境車輛 transit vehicle

國道 national road