真元，见《景岳全书·十问》。指肾所藏之元气。肾位于下焦，故又称下元。
为了纪念元真，达州的人们在这一天成群结队地外出爬山。
To remember Yuan Zhen, all people in Dazhou go out in groups and climb hills on that day.
某些命题对于变元后的任何一种真值状况，它均为真，这样的命题称为重言式。
Some propositions are true for any truth value of their variables. Such propositions are called tautology.
听了妈妈的话，我心里真委屈啊，我喜欢的是880元的那双鞋啊！
Listened to my mother, my heart really wronged ah, I like the 880 the pair Shoes ah!
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