Thousands of people milled around streets littered with gutted buses, iron rods and other random objects that together formed flimsy barricades that would have done nothing to stop a tank.
To recreate the effect of heat flowing through the planet's interior, the researchers stirred this brew with iron paddles attached to iron discs placed at each end of the tank.
为了能重现地球内部热量运动的效果，研究人员将与容器两端的铁盘相连的铁桨浸于溶液内，并搅拌。
3
The water was reacting with the ferrous iron in the tank.