He had only a rudimentary knowledge of French.

他只有最基本的法语知识。

《柯林斯英汉双解大词典》

We have a rudimentary knowledge of it.

我们已有一个初步了解。

youdao

I have only a rudimentary knowledge of chemistry.

我只有些粗浅的化学知识。

youdao

And even six-month-olds are sensitive to these rudimentary facts of arithmetic, telling us something about their mathematical knowledge, but also telling us something about that they expect things to remain when they're out of sight.

即便六个月大的婴儿,对算术的基础知识已经相当敏感,向我们展示了婴儿所具有的数学知识,但也同时告诉了我们,婴儿在看不到物体时,仍然会认为物体依然存在

耶鲁公开课 - 心理学导论课程节选

Anyone with the most rudimentary knowledge on the subject understands this is akin to equating Macallan 25 year-old Scotch with hillbilly moonshine.

FORBES: Shale Oil and Natural Gas - Whose Bubble is Really About to Burst?

Anyone with even rudimentary knowledge of the first Great Depression is aware of the thousands of companies, including seemingly impervious giant corporations, that ran out of cash and did not survive.

FORBES: Corporate Cash Can Pick Up Where The Fed Leaves Off

But the data I am referring to today is not the massive influx of data that is now available for dissemination and use, but is the most basic, rudimentary knowledge every marketer should be capturing.

FORBES: Forget About Big Data, Some Marketers Don't Even Collect Name And Address