Lead found in these materials is subject to very little leaching over the life of an appliance or crown.

这些材料中的铅在牙冠和器具的正常使用下几乎是不会渗出来的。

youdao

Lead found in these materials is subject to very little leaching over the life of an appliance or crown.

这些材料中的铅在牙冠和器具的正常使用下几乎是不会渗出来的。

youdao