She was an engineering major in college.

她读大学时主修工程学呢。

So, atomic clocks have two major engineering challenges: precision and stability.

因此，原子钟面临两大工程挑战：精度和稳定性。

This is why you see some engineering majors, those who went to school for engineering, they have a higher return on investment because their degree pays more.

这就是为什么你会看到一些工程专业的学生，那些工程专业的学生有更高的投资回报，因为他们的学位报酬更高。

" The road probably doesn't rank with the pyramids as a construction feat, but it is a major engineering achievement" , said his colleague, geologist James Harrell of the University of Toledo.

" 这条路比不上金字塔的建筑壮举，但是一项重大的工程成就，他的同事、托莱多大学的地质学家詹姆斯·哈勒尔说道。