One key to understanding is to realize exactly why it is that the kind of bug report non-source-aware users normally turn in tends not to be very useful.
You'll want to be sure to always return null if no match occurs, so that entity resolution will occur normally in non-special cases.
当不匹配时，您会希望始终确保返回 null ，这样实体解析在非特殊情况下都可以正常进行。
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Most people experience tension specifically in the tongue, jaw, face, neck, or shoulders and are normally unaware of how much that consistent stress impacts their verbal and non-verbal communication.