A third of people over 65 fall at least once a year. Half of those fall more frequently.
65岁以上老年人中有三分之一每年至少要摔倒一次，这三分之一的老年人中有一半摔倒不止一次。
In a few months or half a year, go over the first book once again; you are sure to understand much more than before.
几个月或半年后再将第一本书看一遍，你肯定会比以前理解要好得多。
In a few months or half a year, go over the first book once again.
过几个月或半年，把第一本书再复习一遍。
I once had some friends, yet have no clue why even the longest friendship among all still could not last over half a year.
我原来有一些朋友(这个要强调是原来有的，现在已经都没有了)，但是不知道为什么最长的也就坚持了不到半年。
I once had some friends, yet have no clue why even the longest friendship among all still could not last over half a year.
我原来有一些朋友(这个要强调是原来有的，现在已经都没有了)，但是不知道为什么最长的也就坚持了不到半年。
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