我大概未把自己的意思表达清楚。

Perhaps I have not expressed myself very well.

《牛津词典》

短信往往只用几个字就能将意思表达清楚。

Short messages are often written clearly in a few words.

youdao

你应该把意思表达清楚。

You ought to make yourself understood.

youdao

it's very difficult when one is so articulate and is able to express exactly what you want to say,

当一个人已经熟谙一门语言，能够用这门语言清楚明白地表达意思，

想学好英语吗？ - SpeakingMax英语口语达人

sometimes it's really hard to, you know, sort of get the idea across.

而且有时候也很难清楚表达我的意思。

教英语 - SpeakingMax英语口语达人