What's the word for "purpose" in English? How do you say "the purpose of" in English?

the purpose/aim of mainly means ".....

The objective is to do sth/aim to do sth These two words mean "the objective is to do ...........".

The objective of /the goal of struggle translates as "the goal of struggle"

Expanded Information

Sentence-making:

1. This paper is a systematic study of English brainteasers from the point of view of semantics, with the aim of analyzing their semantic strategies and elucidating their inner mechanisms.

This?thesis?attempts?to?make?a?semantic?study?of?conundrums?for?the?purpose?of?analyzing?the?semantic?strategies?and? exploring?the?internal?mechanism?of?conundrums.?

2. English brainteasers are an important form of English riddles, through which people can achieve the purpose of entertainment.

As?a?form?of?English?riddles,?conundrums?are?usually?propounded?to?make?fun.