There are a number of vitamins that are vital for good hair health, the main ones being vitamins C, D and E, and in a balanced diet all these vitamins should be readily available.

有许多对头发健康至关重要的维生素，主要有维生素C、D和E，而在平衡的饮食中所有这些维生素应该很容易获得。

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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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After you hear a question, you must choose the best answer from the four choices marked A, B, C and D.

听到问题后，必须从A、B、C、D四个选项中选出最佳选项。

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Basically,it's like lip synching with a guitar." Lance "The Shred" Kasten from Washington,D.C.,made it to the final round of competition.

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Again I should have said first, index 0, the first one. I can similarly go in and say I'd like all the things between index 2 and index 4. And again, remember what a b c that does. Index 2 says start a 0. 1, 2. So a, b, c.

我还是要说一遍，索引为0的元素，是第一个元素，我可以要求返回索引,2和4之前的所有元素，请记住2,是从0开始的,那么0，1，2对应的是。

麻省理工公开课 - 计算机科学及编程导论课程节选

which is one of the few museums in D.C. that actually isn't free because it's not a national museum.

那是特区里少有的几个收费博物馆之一，因为它不是国家博物馆。

大都会艺术博物馆 - SpeakingMax英语口语达人

Basically, 44% of the hospitals reviewed were given a C, D or F.

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The 1-10 system has no become equivalent to the scoring system of most schools. 90-100 is an A, 80-89 a B, 70-79 a C 60-69 a D and below that a failing grade.

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Investors in A, C or D shares, should pay even more attention.

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