- 心理防线 xīnlǐfángxiàn psychological barriera person's psychological defenses or emotional barrier
- 边防线 biānfángxiàn border defense linea border line equipped with military defenses; frontier line
- 马其诺防线 mǎqínuòfángxiàn Maginot LineThe defensive line built by France along its eastern border from 1927 to 1935 to prevent German invasion; named after the French Minister of War, André Maginot.
- 齐格菲防线 qígéfēifángxiàn Siegfried LineSiegfried Line, a system of German military fortifications along the border with France during World War I and World War II
