Williams syndrome: A genetic disorder characterized by mild mental retardation, unique personality characteristics, unusual facial features, and cardiovascular disease. The level of calcium tends to be high in blood (hypercalcemia) and urine (hypercalciuria).
Long March: Long March, (1934â35), the 6,000-mile (10,000-km) historic trek of the Chinese communists, which resulted in the relocation of the communist revolutionary base from southeastern to northwestern China and in the emergence of Mao Zedong as the undisputed party leader. Fighting Nationalist forces
History >> Ancient China. The Grand Canal is a man-made waterway that runs north and south in eastern China. It is the longest man-made waterway in the world. How long is it? The canal stretches over 1,100 miles from the city of Beijing to the city of Hangzhou. It is sometimes called the Beijing-Hangzhou Canal. Besides connecting these two major cities, the canal also connects the two major rivers of China: the Yellow River and the Yangtze River.