Love involved IN suffering or happiness in some individual associated WITH "不老男人", does not need 75年 to prove, both are not required necessarily by time.
"In logic, necessity and sufficiency are implicational relationships between statements.[citation needed] The assertion that one statement is a necessary and sufficient condition of another means that the former statement is true if and only if the latter is true. That is, the two statements must be either simultaneously true or simultaneously false. In ordinary English, ‘necessary’ and ‘sufficient’ indicate relations between conditions or states of affairs, not statements. Being male sibling is a necessary and sufficient condition for being a brother. Fred’s being a male sibling is necessary and sufficient for the truth of the statement that Fred is a brother." So, we may say love is necessary but not sufficient, one needs to pursue further happiness as it become social trend in current society, :) just kidding.
thx 不老男人 ! yours is an eye catching majia for freshness.
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