双序列比对:全局比对或局部比对算法，针对蛋白质序列或核酸序列-This program will do Needle global or Smith-Waterman local alignment for two protein sequences or DNA sequences

局部序列比对的代码，可以找到2条长字符串中共有的特征序列，其中包含空格惩罚。-Local alignment tool and it cound find the similar pattern of two sequences with the assistant of gap penalty.