核反应中的中子轰击导致了元素的嬗变。

Neutron bombardment in nuclear reactions causes the ___transmutation of elements.

青蛙从蝌蚪到成体的神奇变化令学生们惊叹不已。

The ___transmutation of a tadpole into a frog amazed the students.

科学家们研究如何通过核反应实现铅到金的嬗变。

Scientists are studying how to achieve the ___transmutation of lead into gold through nuclear reactions.