喜欢就争取:Strive for it if you are fond of it
Work hard /assiduously for it if you enjoy / like /want it
得到就珍惜:Cherish it if you've got it
Treasure it once you've obtained /had/ acquired it
错过就忘记 :Forget about it if you've missed it
Be oblivious of it if you've lost it
求翻译英文:Ask for translation