These powder-like microbeads aren't toxic, and their chemical and physical properties are similar to sand.

这些像微珠一样的粉末是无毒的，它们的化学和物理属性类似于沙子。

Because of its unique chemical and physical properties, water is absolutely essential for all life as we know it.

由于水独一无二的化学和物理特性，它是生命不可缺少的物质。

But we've already seen in a couple of cases, a few elements that deviate a little bit, both chemically and physically, their chemical and physical properties from what they should be.

但我们已经在几个案例中看到，一些元素在化学和物理上都与它们应有的化学和物理性质有一点偏差。