一兆焦相当于一个一吨重的物体以160公里/小时的速度撞一面墙产生的能量。
A megajoule is equivalent to the energy released when a one-tonne vehicle slams into a wall at 160kmh.
这些由Wajih Naqvi和维克多•斯莫塔希克领导的研究者给300平方公里的海域里面投加了6吨的可溶于水的硫酸铁作为浮游生物的肥料已让他们生长。
Those researchers, led by Wajih Naqvi and Victor Smetacek, created a bloom of phytoplankton by fertilising an area of 300 square kilometres with six tonnes of iron sulphate, which dissolves in water.
据信，目前在我们头顶上几公里之内的空间内漂浮着超过5500吨太空垃圾。
It is thought more than 5,500 tonnes of junk now clutters the region of space just a few hundred km above our heads.
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