dysprosium

例句：

1. 1. The atomic clock is based on the principle of radioactive decay, which involves the emission of a specific type of radiation.
   原子钟基于放射性衰变的原理，涉及特定类型辐射的发射。
2. 2. Dysprosium is a rare earth element that has been found in various minerals and rocks.
   镝是一种稀有元素，已在各种矿物和岩石中找到。
3. 3. In the field of optics, dysprosium is used to create highly efficient lasers and other optical devices.
   在光学领域，镝用于制造高效能激光器和其他光学设备。