Alignment的意思是：对齐，排列，校准。
例句：
The students were aligned in rows according to their height. （学生们按照身高排成几行。）
The DNA sequences were aligned to compare their similarity. （这些DNA序列被排列在一起以比较它们的相似性。）
The bookshelf was not aligned with the wall, causing it to look uneven. （书架没有和墙壁对齐，导致看起来不整齐。）
