In the A, B, C, D and F grading system, the first four letters are typically considered passing grades.

在 A、B、C、D 和 F 评分体系中，前四个字母通常被认为是及格。

youdao

The system is composed of industrial PC, DMC300 motion controller, discharge status checking card, A/D card, I/O card and pulse power.

该系统由工业 PC，DMC300 运动控制器，放电状态检查卡，A/D 卡，I/O 卡和脉冲电源组成。

youdao

There probably is a risk to having too much vitamin D in the system.

可能会发生系统里存在过多维生素d的风险。

youdao

Researchers say they observed shortages in the brain's reward system in patients with A.D.H.D.

VOA: special.2009.09.29

Well it was a messy system so you'd only get like ninety cents on the dollar.

它是一个混乱的系统,所以一美元的纸币可能就值九十分了。

耶鲁公开课 - 金融市场课程节选

but I'd like to, I'd love to see a system where, where you can work as an attorney no matter what

但我希望看到的制度是，你可以当律师，不论你的学历如何，

想成为律师的话 - SpeakingMax英语口语达人

System D is a slang phrase pirated from French-speaking Africa and the Caribbean.

FORBES: Could Bitcoin Become the Currency of System D?

The under-banked people of System D would awaken to using bitcoin for eliminating onerous fees or the risk of handling cash.

FORBES: Government Ban On Bitcoin Would Fail Miserably

To deny the existence of System D is to deny the fact that economic participants find ways to survive even during prolonged times of hardship.

FORBES: Could Bitcoin Become the Currency of System D?