Ths system can resist conspiracy attack, simplify the executing process and reduce the traffic cost.

新的方案不仅避免了同谋攻击，而且简化了原方案的执行步骤，降低了通信量。

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She used Google AdWords to get targeted, low cost traffic.

FORBES: Extreme Outsourcing

Such techniques have pushed the cost of carrying traffic on fiber down to about 1% of what it would cost on all-electronic equipment, and it will keep falling.

FORBES: Hooked on photonics

All the talk about the social cost of traffic congestion is a canard.

ECONOMIST: A survey of commuting