The rule was introduced expressly for this purpose.

这项规则是为此特意推行的。

For this purpose indeed have I journeyed forth.

为了这个目的，我向前出发了。

A box had been ready for this purpose many days.

为了这个目的，一个箱子已经准备了许多天了。

For this purpose, each member had to contribute a tenth of his income.

为了这个目标，每个会员要贡献出自己收入的十分之一。

For this purpose, select ripe bananas for freezing as they are sweeter.

为此，要挑选熟透的香蕉进行冷冻，因为它们更甜。