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.