Do what you love while you still have time to do it; learn what you want to know while you still have time to learn; do the things you have thought of while you still have time. You know that time past cannot be called back again.
喜歡做什麼就去做吧，趁着還有時間；想學什麼就去學吧，趁着還有時間；想到什麼就行動吧，趁着還有時間。要知道，光陰流逝，不可複得。
call back 收回；回電話
think of 想到，想起
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