Crushed shell, just like at the previous scene.

碎贝壳跟之前的现场一样
What about the other rubble we found at the point of entry?

我们在入口发现的另一种石块呢
A little more interesting.

更有意思一点
"Concrete and titanium oxide""

混凝土和氧化钛
Otherwise known as smog-eating concrete.

也称作绿色混凝土
A new, unique material that helps reduce pollution.

一种新型独特减少污染的材料
The chemical additive is activated by sunlight

化学添加剂被阳光激活
and turns smoggy toxins into less-harmful compounds upon contact.

把有毒的烟雾化为危害较小的物质
So where in Vegas can this stuff be found?

维加斯哪些地方有这东西
It might help us find our assailant's point of origin.

或许能帮我们找到嫌疑犯来自哪里
It's in limited use nationally.

这种混凝土在全国都是限量运用
Haven't had the chance to determine

我还没来得及查看