She pressed start on her iPod and began keeping track of every step she took.
她按了iPod的播放键，开始记录所跑的每一步。
Finally, a simplified flight track model was proposed based on time step.
最后给出了根据时间步长推算的飞行轨迹简化计算模型。
When this happens, your first step is to track down the source of the problem.
发生这种状况时，第一步骤便是追踪搜寻问题的来源。
Step 3: Keeping track of all of this stuff.
第三步：跟踪阅读相关材料。
Step 3: Keeping track of all of this stuff.
第三步：跟踪阅读相关材料。
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