1. The stored materials are tested viability every five years. �������ز���ÿ������һ����������
2. In it, each describes specific steps they plan to take to get on the road to economic viability. ���У�ÿ�Ҷ��������Ǽƻ��ڵ��ᆳ�����������ĵ�·�ϲ�ȡ�ľ��岽�衣
3. The dilemma is that evolutionary theory says that what is maintained in a lineage is that which ensures the viability of an organism and its offspring. ���ٵ������ǣ�����������Ϊͬһ��ϵ�б�����ά�ֵ�����Щ��ȷ��������������������Ķ�����
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n.
1. (of living things) capable of normal growth and development
2. capable of being done in a practical and useful way