Predicting how fast a person will be jogging two years hence is tricky, especially when that person is currently flat on his back in a hospital's intensive-care unit.
预测一个人在接下来的两年里跑步能有多快极其困难的，尤其是当这个人现在正躺在一家医院的重症监护病房的时候。
For instance, each record might contain one household unit, two family units, and four person units for each family unit.
举例来说，每笔记录可能包含一个家户单位，二个家庭单位和每个家庭中的四个个人单位。
Second-in unit, a two-person ambulance crew spotted the ambulance immediately behind the fire engine and went into the debris field and began assessing patients.
第二个进入的单位，是一个两人组的救护车，停于消防车之后，进入飞机碎片地区，开始救援伤员。
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