If you ignore 1900, you can figure out if a given year is a leap year just by looking to see if the rightmost twobits are zero.
如果你忽略1900年，你就可以通过观察最右边的两位是否都为零来判断某一年是否为闰年。
2
If at any point, you've got something you want to ask about or some twobits you want to add, raise your hand and wiggle it around to make sure I see you.
任何时刻，如果你有什么想问的或者有什么想补充的，请举手并左右摆动，确保我能看到你。
3
Or, to put it slightly differently, twobits of nature disagree with each other.