在他们成长的这些年里，生活肯定发生了明显的变化，因而现在可自由分配的时间、金钱和注意力也更为有限。
Their lives have obviously changed in the intervening years -- so that available time, money, and attention are now in more limited supply.
因此，必然会引发长时间的暂停来整理碎片或进行压缩，堆将很多小块的自由内存区域整合为一块大的自由内存区域，从而满足大型分配请求。
Consequently, it must incur a long pause to defragment, or compact, the heap to coalesce many smaller free memory areas into larger free memory areas to satisfy a large allocation request.
学校可以随意的选择所使用的教材，甚至可以自行编写教材，还可以自由的分配教学时间。
Schools can choose their own texts, even write their own, and apportion the school day as they please.
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