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1.rare occurrence 罕见事件
However, this is a fairly rare occurrence, and it only wastes a little memory.
不过，这种情况极少发生，而且它只会浪费少量内存。
2.record low 历史最低值
The euro hit a record low in trading today.
今天欧元的兑换价降到了历史最低水平。
3.shot up 暴涨
Ticket prices shot up last year.
票价在去年可谓是暴涨。
