I can't figure out how to do this.

我弄不懂怎样做这件事。

《牛津词典》

There are fundamental public health problems, like dirty hands instead of a soap habit, that remain killers only because we can't figure out how to change people's habits.

一些基本的公共卫生问题，例如脏手而不是肥皂习惯，仍然是棘手的问题，仅仅因为我们无法弄清怎么去改变人们的习惯。

youdao

I can't figure out the rules of football.

我不懂足球的规则。

youdao

But we are going to need you, not just here today, but you're going to have to go home and take some of what you've learned here and teach your families and folks -- the other kids in your schools who haven't had a chance to come, and figure out how you guys can get other people in your lives moving."

VOA: special.2010.06.07

It's never perfect and we can't figure out yet a way to make it perfect and we still have small investors who are defrauded, who are treated badly.

事无完美,至今还没有完美的办法,仍然有许多小投资者,遭受欺诈,成为受害者

耶鲁公开课 - 金融市场课程节选

And you can't figure out who it is.

但是你想不起来是谁。

Is there any 课堂 - SpeakingMax英语口语达人

If we can't figure out the transparent U.S. economy, China will prove harder still.

FORBES: Magazine Article

Sometimes, you have the vision but you can't figure out how you can get the million dollars.

BBC: African Dream: Malawi's Gospel Kazako

"She can't figure out how they can have everything she needs at better prices, " says Eugene Sit.

FORBES: The jelly bean team