The usual sequential shortest path algorithms executing on sequential computer have nearly reached their time complexity limits.

针对通常的串行计算机的串行最短路径算法，几乎已经到达了理论上的时间复杂度极限。

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The curvature of the earth limits a microwave's line-of-sight path to about 48 km.

地球表面的弯曲度把微波的直线行程限制在48公里左右。

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The curvature of the earth limits a microwave's line-of-sight path to about 30 miles.

地球表面的弯曲度把微波的直线轨迹限制到30英里左右。

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Hence the rise of services such as Path, an American network that limits members to 150 friends.

ECONOMIST: The world��s most exclusive social network

Privacy concerns over the issue were touched off last week when a Web developer blogged about his discovery that Path, an emerging social app that limits users to 50 friends, was uploading his iPhone address book to its servers.

CNN: Doug Gross,

It is a path Kennedy has chosen, in part, out of awareness of his own limits.

CNN: latimes.com: Talking baseball and politics with George W. Bush