All four collections reached the Top 5 on Billboard's Pop Albums Chart.

VOA: standard.2009.11.25

We have some students who enter on an athletic team and stay all four years with that team.

有些学生是因为体育特长,而被录取，而且大学四年,仍然从事那项体育活动。

普林斯顿公开课 - 人性课程节选

All right, so in terms of s p 3 hybrid orbitals, let's combine all four together on one axis, because this is what's going to happen in an s p 3 carbon atom.

对于sp3杂化轨道，让我们把4个结合起来，因为这是sp3碳原子中发生的情况。

麻省理工公开课 - 化学原理课程节选