resolidify       
verb [ I or T ] (also re-solidify) uk/ˌriː.səˈlɪd.ɪ.faɪ/
 (使)(液体或气体)再次固化,再次凝固
to change from being a liquid or gas back to being a solid form again, or to make something do this
  Adding small amounts of water to melted chocolate will cause it to re-solidify. 在已融化的巧克力中多次加入少量的水会使其重新凝固。 
 The chocolate chips usually melt during baking, remain soft for several hours, and then resolidify. 巧克力豆通常会在烘烤过程中融化,并在几个小时内保持柔软,然后重新凝固。 
  - More examples
 - They found that the rock did resolidify within a few weeks.
 - Place the vial in iced water, wait for the contents to resolidify, then heat the water to 30C, at which point the contents will melt again.
 - The gel was melted on a microscope slide and covered with a cover slip; it was then re-solidified during cooling to fix the sample.