When the electric current was on, the woman described seeing a presence or shadow nearby who did not speak or move.

VOA: special.2010.02.24

In an aqueous solution, he passes electric current and causes silver ions to deposit and form metallic silver.

在水溶液中，他接通电流，这得银离子,沉淀，并形成金属银。

麻省理工公开课 - 固态化学导论课程节选