weighing much more than normal, and needing a lot of effort to move or lift

Super-heavy trucks are to be allowed on the country's roads. 该国将允许超重型卡车在道路上行驶。

Superheavy backpacks may harm children's growing bones and joints. 过重的背包可能会伤害儿童正在发育的骨骼和关节。

A super-heavy element is one that has a higher atomic mass (= the amount of substance contained in the smallest unit of a particular chemical element) than uranium

Not many labs have the necessary equipment to do work on super-heavy elements. 没有多少实验室拥有必要的设备来做超重元素方面的工作。