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。

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Although we talked about Vitamin D and sunlight, it can make a huge difference in how you feel if you go to a tanning salon to get some light on your skin.

尽管我们已谈到维生素D和阳光，但是如果你刻意去参加日晒沙龙来摄取阳光到皮肤的话，它会让你感觉到巨大的差别。

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We named both of our kids with Ds. My husband starts with a D and I'm a D.

VOA: special.2009.07.06

In the ancient world,actually,it would've sounded familiar, because there are other stories of other kinds of teachers who'd healed and exorcised demons and performed miracles.

然而在古代，则很耳熟，因为还有其他人，传授知识,治疗百姓，驱魔，创造奇迹的故事。

耶鲁公开课 - 新约课程节选

And that way, you'd make a u-turn and then I'd owe you a lot more money,

那样的话，你掉头行驶，我就得付更多钱了。

Is there 实战 - SpeakingMax英语口语达人

Another who was depressed and drinking heavily was low on vitamins D and B-12.

WSJ: Confusing Medical Ailments With Mental Illness

The spectrum is being auctioned off in five blocks, labeled A, B, C, D and E.

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Over two decades, researchers have seen increased use of calcium, vitamin D and folic acid.

CNN: Half of Americans use supplements