英语中介词for的用法还有“The computation of torque for ideal and practical currents is developed,”这句的for祈祷什么作用呢?这句怎么翻译呢?

for有很多种用法：
1.表示“当作、作为”.如:
I like some bread and milk for breakfast.我喜欢把面包和牛奶作为早餐.
What will we have for supper?我们晚餐吃什么?
2.表示理由或原因,意为“因为、由于”.如:
Thank you for helping me with my English.谢谢你帮我学习英语.
Thank you for your last letter.谢谢你上次的来信.
Thank you for teaching us so well.感谢你如此尽心地教我们.
3.表示动作的对象或接受者,意为“给……”、“对…… (而言)”.如:
Let me pick it up for you.让我为你捡起来.
Watching TV too much is bad for your health.看电视太多有害于你的健康.
4.表示时间、距离,意为“计、达”.如:
I usually do the running for an hour in the morning.我早晨通常跑步一小时.
We will stay there for two days.我们将在那里逗留两天.
5.表示去向、目的,意为“向、往、取、买”等.如:
Let’s go for a walk.我们出去散步吧.
I came here for my schoolbag.我来这儿取书包.
I paid twenty yuan for the dictionary.我花了20元买这本词典.
6.表示所属关系或用途,意为“为、适于……的”.如:
It’s time for school.到上学的时间了.
Here is a letter for you.这儿有你的一封信.
7.表示“支持、赞成”.如:
Are you for this plan or against it?你是支持还是反对这个计划?
8.用于一些固定搭配中.如:
Who are you waiting for?你在等谁?
For example,Mr Green is a kind teacher.比如,格林先生是一位心地善良的老师.
而
The computation of torque for ideal and practical currents is developed中的for是用来连接torque和ideal的