此举目的可用一个（已验证的）理论证明，即真正合并的航空公司通过中心所在提供更低价的机票。
The pursuit of this is justified by a (contested) theory that virtually merged airlines offer lower fares on flights through their hubs.
通过理论证明这种同步误差是收敛到零的。
语用频率和标记理论证明了排除关系是其基本的语义关系，其他的语义关系是通过添加标记词派生出来的。
It can be proved that except is its basic semantics by mark theory and pragmatic frequency. The other meanings are generated by adding some mark words.
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