While as far as space alignment is concerned, in some certain time, IR element has diversion and exchange in quantity and quality to make the IR element flow.
从空间序列看，在一定时间内信息资源要素随着空间变迁而发生的量与质的转移、交换等现象是为信息资源要素流动。
As multiple sequence alignment problem is an NPC problem, so its optimum solution cannot be obtained because of the time and space limits.
多序列比对问题是一个NPC问题，由于时间和空间的限制不能够求出精确解。
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