求翻译：要想让学生很快地掌握语用预设理论，并真正灵活地把它应用到英语写作教学当中，从而提高学生的英语写作水平需要做大量的前期准备工作。是什么意思？

To get students quickly master the language of default theory, and really the flexibility to apply it to the teaching of English writing, thereby enhancing students' English writing skills need to do a lot of preparatory work.

If you want to enable students to master language very quickly with pre-set Theory, and apply it to real flexibility in teaching English writing, and thus improve the students' English writing standards required a substantial amount of preparatory work.

Must want to enable the student to grasp the language with to suppose the theory in advance very quickly, and nimbly applies truely it English writing teaching, thus raises student's English writing level to need to do the massive earlier period preparatory work.

To allow students to quickly grasp the pragmatic presupposition and genuine flexibility in applying it to the teaching of English writing, to improve students ' writing skills in English a lot of preparatory work needs to be done.