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投我以桃,报之以李。
你把桃子投于我,我把李子回赠与你。桃子和李子价值相当,表明我本人是知恩图报的,也有互相赠送,礼尚往来的意思。
The best way to learn mathematics is to do mathematics.
"The true measure of success is how you handle failure."
Love is not a possession, it's an offering.