Iron ore, the main raw material of steel, changed the lakes area and the nation.

VOA: special.2009.11.11

So you pick a better material like iron and steel, that makes a better bridge, we know that now because we have experience with bridges, but still your bridge might fail.

你选择了钢铁作为材料,来造了一座更好的桥,我们现在能够明晰这一点,是因为在造桥这件事上我们现在很有经验,但即使是我们现在造的桥也仍然会倒塌

耶鲁公开课 - 生物医学工程探索课程节选

Companies did produce agreements to restrict, for example, the production of paper and the production of rubber, and the production of steel, and the production of iron, and the production of railway lines, actually, even quite complicated things.

公司之间的签署了限制产量的协议,比如说有造纸业,橡胶制造业,炼钢业,冶铁业,铁路运输行业,当然还有更复杂的行业

耶鲁公开课 - 博弈论课程节选