从那时起，一张罚单开始慢慢累积，每天几美分。 据纽约社会图书馆非正式估计，总计已超过4000美元。
Since then, they've been steadily collecting a fine of a few cents each day, adding up to more than $4,000 by the New York Society Library's informal estimate.
可以通过角速率值的时间积分来估计当前的横滚角度，前提是没有误差的累积。
You can approximate the current roll Angle by integrating the roll rate over time, but you can't do so without some error creeping in.
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