Steel that has been hardened by rapid quenching is brittle and not suitable for most uses.

快速淬火硬化的钢是硬而易碎的，不适合大多数场合使用。

youdao

The rapid rebound in steel demand.

钢铁需求迅速回升。

youdao

To enjoy the benefits of concrete - preventing rapid warming and overheating of the interior - the grooves in the steel sheets are partly filled with concrete.

为了体验混凝土的优势，防止室内热量的快速流失或者升温过高，钢板凹槽部分用混凝土填充。

youdao

Even as India gallops toward First World status--with its booming economy, roaring stock market and rapid progress in autos and steel--it is still a giant back-yard sweatshop to the world, staffed by underage boys and girls.

FORBES: Magazine Article

Rio is betting on rapid urbanization to drive demand for steel and thus iron ore.

FORBES: Rio Tinto's Earnings Show Cost Cutting Efforts And Demand Recovery Are Critical To Outlook