An argument can be either valid or invalid but not true or false.
论点可能有效或者无效，但是不能或真或假。
Often that will be the case because it's invalid but not always.
经常这样是因为他无效，但是不经常。
The invalid reached for the glass but could not get it.
病人伸手去拿水杯，但是够不着。
The invalid reached for the glass but could not get it.
病人伸手去拿水杯，但是够不着。
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