标题: 有谁知道这个so的用法 谢谢 [打印本页] 作者: abc791201064 时间: 2013-6-7 11:58 标题: 有谁知道这个so的用法 谢谢 Unlike frogs that metamorphose from tadpoles into adults within a one-year period,mountain yellow-legged frogs of the Sierra Nevada take three to four years to reach adulthood,and so they are restricted to deeper bodies of water that do not dry up in summer or freeze solid in winter.