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. 但是and和so都是连词,两个连词不是不可以一起用么?
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. So they are restricted to deeper bodies of water that do not dry up in summer or freeze solid in winter.
这样就能看出来两个句子的关系,并非主从,而是因果。 验证一下,把 SO 换成 THAT'S WHY
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 THAT'S WHY they are restricted to deeper bodies of water that do not dry up in summer or freeze solid in winter. 木有问题