能够方便放置状态机代码的位置。
这些磁带用塑料包裹着，放置在一个防磁的金属罐中，仍然处于原来的状态。
The tapes were wrapped in plastic, placed in magnetically impervious metal canisters and remain in pristine condition.
如果它被放置在消息列表之后，并且用户在脱机状态下已删除了一条消息，那么脱机服务器在同步过程中将会丢失，因为列表的大小会发生变化。
If it had been placed after the list of messages, and a user had deleted a message while offline, the offline server would become lost during synchronization because the list size would have changed.
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