Experts emphasized one new cement mixture that gets the clinker ratio safely down to 50% by supplementing it with more clay and unprocessed limestone.

专家们强调了一种新的水泥混合物，通过添加更多的粘土和未加工的石灰石，可以将熟料比例安全地降低到 50%。

Instead, the reaction produced only heat, a damp sigh of water vapor -- and a Roman-like cement mixture bearing small, white, calcium-rich rocks.

相反，反应只产生热量、一股潮湿的水蒸气，以及一种类似罗马水泥的混合物，其中含有白色的富含钙的小岩石。