The feet track closely but do not strike or cross over.

足迹靠近，但不能重叠或交叉。

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Brown and Diller say their site is on track to cross over into profitability within two years.

FORBES: NewsBeast Merger a (Pyrrhic?) Victory for Tina Brown

How to track monthly spending patterns in order to determine when employees cross over from one usage category to another?

FORBES: AT&T and Verizon Considering Complex New Data Plans