用统计学的语言来说就是随着抛掷增加(假定抛币条件不变)，相对频率越来越稳定。
In statistical language, we would say that the relative frequency become stable as the number of tosses becomes large (if we are tossing the coin under uniform conditions).
方法统计我院1997 - 1999年抗感染药物的消耗及经费支出，计算其使用的相对频率及相应费用。
Methods Statistical materials in our hospital during 1997-1999 period was investigated in respect to the sum of consumption cost, drugs used and DDDs.
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