aIt was quite necessary to investigate the regional development as an integral part of the whole social and economic system, specify its orientation in and influences on social and cultural development of whole society. 调查区域发展作为整体的整体部分社会是相当必要的,并且经济体制,指定它的对整体社会的...
When an embryo becomes a fetus at eight weeks, it is approximately 3 centimeters (1.2 inches) in length from crown to rump and weighs about 3 grams (0.1 ounce). By the time the fetus is considered full-term at 38 weeks gestation, he or she may be 50 centimeters (20 inches) or 3.3...