From Mao Zedong's 《
水调歌头·
游泳》 (1956), written after he swam in the Yangtze at Wuhan:
一桥飞架南北,
天堑变通途。 The 'bridge' is the newly built Wuhan Yangtze River Bridge (1957) — the first to span the Yangtze. The line became shorthand for modern infrastructure conquering geography.