To know with confidence that the coin is ordinary, with no hidden features, one must log a sufficiently large number of coin flips and check whether the data include equal numbers of heads and tails over the long run. After thousands of coin tosses, if the data still show a bias toward heads, one may be justified in thinking that the coin has some unusual properties.
要想确信硬币没有不为人知的功能，的确是普通硬币，你就必须记录足够数量的抛掷结果，并检验长期结果数据中正面和背面的出现是否等量。数千次抛掷后如果数据仍然显示正面居多，那么就有理由认为这枚硬币具有某些特殊性质。