到50年代初，在西欧建成了十余座体外预应力砼桥梁。
More Than ten extraneous prestressed concrete bridges had been constructed by the early 1050s.
二期：建筑面积60亩，建成后奶牛存栏量达600头，可带动农户500余户。
B: building an area of 60 acres, will have cow herds reached 600, the farmers may bring more than 500 households.
结果建成细胞系CM 319，经近两年的体外培养，已连续传代百余次。
Results The newly established cell line CM 319 has been maintained in continual cultures for over 100 generations in two years.
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