因为所有对象都是从8字节边界开始，并且大小可以被8整除，所以底部的3位不用于表示大小；我们将其作为标志，用于表示对象的不同状态。

As all objects start on an 8 byte boundary, and the size is divisible by 8, the bottom 3 bits are not used for the size; we use them for flags to indicate different states of the object.

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为了修正这一误差，教皇规定大多数十几年(比如1700,1800及1900年)不能作为闰年。但是能够被400整除的世纪年数，比如2000年，就可以作为闰年。

To fix the problem, the Pope decreed that most century years (such as 1700, 1800, and 1900) would not be leap years. But century years divisible by 400, like 2000, would be leap years.

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数学归纳法可以用来证明与正整数有关的恒等式、不等式、整除性问题和几何问题等。

Mathematical induction can be used to prove the positive integers and Identities, inequality, and the divisibility of geometric problems.

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