It returns null if the source string is null or empty.
如果源字符串是null或空，则将返回null。
If the source string is null or empty, then 0 is returned.
如果源字符串是null或空，则将返回0。
The old password is wrong or empty.
原密码错误或为空。
An object or column name is missing or empty.
缺少或为空的对象或列名。
The solution is to clear or empty your browser's cache .
解决办法是清除或者清空你的浏览器的高速缓冲存储。
Overdo focus on your partner, and you feel anxious, resentful, or empty.
过分关注你的伴侣，你感到焦急不安，愤愤不平，或空虚。
Overdo focus on your partner, and you feel anxious, resentful, or empty.
过分关注你的伴侣，你感到焦急不安，愤愤不平，或空虚。
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