Explanation: Accessible. Describe the accessibility clear.
No. 2
Extending in all directions. Described unobstructed accessibility. "Records of Li Sheng Lu Jia Biography": "Cardiff chenliu, the world of the red, four-way over the countryside is also five." Pei Yin: Annals cited as Chun said: "four central, where the five up also." Ming Jingming "Seven out": "God is the land of abundance, four-way over the relevant five."
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No. 3
Described as a very convenient traffic. Also described the leading parties.
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No. 4
词 目 四通五达 发 音 sì tōng wǔ dá
释 义 四通八达。形容交通畅达无阻。
示例：宋·洪迈《容斋随笔·地险》：“唯宋卫之郊，～，无一险可恃。”
近义词：四通八达