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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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"American exports grew almost seventeen percent over the first four months of this year, compared to the same period last year.

VOA: special.2010.07.09

And these investigators claimed this is because they had been exposed to French in the first four days of their lives.

这些研究者宣称,这是因为他们在出生的头四天里,暴露在了法语环境中

耶鲁公开课 - 心理学导论课程节选

So, we have beryllium in the first case here, it has four electrons, that's how we know it's beryllium, boron has five electrons.

那么我们将铍作为第一个例子，它有四个电子，这也是我们为什么能知道它是铍的原因，硼有五个电子。

麻省理工公开课 - 化学原理课程节选

The 22-year-old took the first four wickets to fall before Blackwell pinned Samit Patel lbw 122-5.

BBC: Munday spins Notts into trouble

Medium pacer Mahmud, who took three of the first four wickets, finished with 3-33 and M.

BBC: Bangladesh win tour opener

G. was depressed for a while, " says Crandall, "The first four months were the hardest.

CNN: When beloved pet and new baby collide