Its texture is naturally noble, and non - radioactive, it is a real home - made, high - end , and eco - friendly stone.

其自然高贵, 无放射性, 是一种真正的国产 高档 环保石材.

互联网

Stable isotopes are non - radioactive, so they are safe and suitable for the study of human nutrition.

稳定同位素不具有放射性, 使用安全,适于人体营养学研究.

互联网