并列题名：China in 20th century China in 20th century 并列题名：Warfare in the 20th century 并列题名：20th century 并列题名：American law in the 20th century 并列题名：Western art in the 20th century 并列题名：French philosophy in 20th century 并列题名：Decades of the 20th century 并列题名：Chronicle of China-20th century 并列题名：China-Canada relations: 20th century