采用将圆电流磁矢势表达式中一部分展成级数，使被积函数变成可积分的函数。
A part of results on magnetic vector potential of circular loop are expanded, so the integral function is transformed to integrable series.
当积分达到100、200和300时，志愿者可相应获得铜章、银章和金章。
When the points reach 100, 200 and 300, volunteers are eligible for a bronze badge, silver badge and gold badge respectively.
在时间银行里，会员可以通过为其他会员提供服务来获得积分，服务范围可包括做饭、整理家务、开车接送，以及家庭维修等。
In a time bank, members get credit for services they provide to other members, from cooking to housekeeping to car rides to home repair.
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