compressing

1.The associational operation between records in multi-dimension array and compressing method of multi-dimension army are stated.

表达多维数组中记录间的关运算和多维数组的压缩方法。

2."My means of ascsion and descension consist only in dilating or compressing the gas inclosed in the balloon."

“我使气球升降的方法，是使气球里的气体膨胀和收缩。