unusual extraordinaryuncommonfew and far between都可以解释作 难得These presents for you are the medals commemorating our school's anniversary. Hope you will like them!校庆纪念章 school anniversary commemorating medal
valuable
Priceless
it's a hard won opportunity
This is a once-in-a-lifetime shot.这是比较口语化的美式表达
This opportunity is hard to come by and I really cherish it.
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zhuhuals2008
