Without threaded conversations, however, it can be hard keep track of conversations. Instead of using sub-threads like Yammer, Nurphy borrowed Twitter's @reply structure.

但这些对话不是像帖子连在一起的，要想跟踪对话很难，Nurphy借用了Twitter的@回复。

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The sub-system is designed to track target in real time in complex background and provide the firing control system with important target status information.

该子系统用于复杂背景条件下运动目标的实时跟踪，进而为火控系统提供重要的目标状态信息。

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This product is applicable to city express way: main trunk road, sub-trunk road, spur track, roads of factory, school and park, various residence roads and courtyard etc.

本产品适用于城市快速路：主干线、次干线、支路、工厂、学校、公园、住宅小区、庭院等道路照明。

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In recent months, US forces in Afghanistan have pledged to increase their oversight of security contractors and set up task forces to track the money spent among sub-contractors.

BBC: Afghan security contractors 'fund Taliban'

The U.S. economy appears to be on track for a mild recovery, after years of sub-par growth, while the labor market remains depressed.

FORBES: U.S. Companies Stashing More Cash Abroad As Stockpiles Hit Record $1.45T

Users answer demographic questions and participate in daily and live-event polls, and because Microsoft can track someone over the course of the election season, much can be learned about the swing voter sub-population.

FORBES: Not Your Grandmother's Presidential Debate