Evan was silent for a moment. The things in front of him only changed his appearance from the outside, but some things, such as his voice, could not be changed.
Robert was very considerate after following Evan for many years, so he added, "At present, there are only two ways to change the voice. One is through vocal cord plastic surgery, while the other is through imitation practice."
These were the ways Robert has known so far to make Evan's voice unrecognizable.
"The imitation practice takes a long time while the vocal cord plastic surgery takes a short time. The surgeon will inject the botulinum in the vocal cord, or adjust the length of the vocal cord to achieve a variable voice. It has no side effects, but the botulinum will disappear with time. About one or two months later, your voice will return to the original automatically."
"You know a lot."