那时教学时兴的主要是书面语。

The fashion at the time was for teaching mainly the written language.

《牛津词典》

这项业务主要是改造更新现有的飞机。

Much of this business involves retrofitting existing planes.

《柯林斯英汉双解大词典》

这主要是个反复实验的问题。

It was largely a matter of trial and error.

《牛津词典》

The Washington Post surveyed its readership and discovered that ask people what they thought was the most significant causes of the shooting.

华盛顿邮报》在读者中进行了调查,并且发现当询问人们,他们认为,枪杀案发生的主要原因是什么。

麻省理工公开课 - 媒体、教育、市场课程节选

Beverly Hills is mostly, people that live in Beverly Hills are mostly the people that are behind the scenes

比佛利山庄主要是，住在这里的人们主要是幕后制作人员，

演艺界起源地 - SpeakingMax英语口语达人

How can you write an original poem when your literary consciousness is essentially made up of the memory of all the things that you've read before?

你怎么能说自己写的是原创的诗,当你的文思,主要是由你以前阅读积累下的记忆,组合成的呢？

耶鲁公开课 - 弥尔顿课程节选