These backpacks are designed to carry a heavy load.

这些背包是为携带重物设计的。

《牛津词典》

It is cruel of him to make the donkey carry such a heavy load.

他真心狠， 让驴驮这么重的东西。

《新英汉大辞典》

The shoulder pole bent with heavy load.

重担压弯了扁担。

《新英汉大辞典》

Not bad for a 23-year-old with a heavy course load (Kyodai's law faculty is one of the most rigorous in Japan).

CNN: ASIANOW | The Asiaweek Best Universities 1999 | The Rankings | #2 Kyoto University

Oxidation catalysts and other emissions controls can be installed to reduce the polluting effect of diesel generation and it must also be considered that peak-shaving DR resources will displace peaking units which are the most pollution-heavy resources on the supply-dispatch curve that are also closest to load centers.

FORBES: Connect

But to meet admissions standards for Ivy League schools, Luke had to take such a heavy load of courses, advanced-placement exams and extracurricular activities that he worked seven days a week for almost two years.

WSJ: High School, in Three Years