为什么要用through the telescope而不用with the telescope

表方式的介词
by
on/in
with
in
through by表“用交通工具”或表“发出某动作”；
on/in表用某交通工具；
with用具体的“工具、材料”或伴随“抽象事物”；
in用原料或语言；
through通过具体过程,途径,手段,中介. I go to school by bus.
I go to school on a bike.
I write with a pen.
Can you say it in English?
I learned it through a friend.