请帮忙翻译"总是要到失去后才懂得珍惜"
"you don't know what you've got till it's gone"
-Counting Crows feat. Vanessa Calton 唱的 'big yellow taxi'
Things are only valued when they are lost.
Things are only valued when they are gone.
Only after they are lost are things truly valued. (好听点).