For two years she has maintained a 4.0 grade-point average, meaning A's in every subject.

两年来，她每门课的平均成绩保持在四分，也就是每门课得到的都是A。

Most people believe they're better than average at just about anything they care about, which isn't strictly possible, because that's just what average means.

大多数人认为他们在他们关心的任何事情上都比平均水平好， 这在严格意义上是不可能的， 因为这就是平均水平的意思。