指示当无法对输入代理项对进行编码时是否可以使用替换字符串，或者是否可以忽略代理项对。
Indicates whether a replacement string can be used when an input surrogate pair cannot be encoded, or whether the surrogate pair can be ignored.
团队可能需要重新检查优先级别，以确定问题实际上是否是应该解决的问题，或者团队是否可以忽略这些问题。
The team might need to reexamine priorities to determine whether the Issues are actually problems that it should address or if the team can ignore them.
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。
If you ignore 1900, you can figure out if a given year is a leap year just by looking to see if the rightmost two bits are zero.
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