[Solved] message was cropped and render un-usable, sometimes, for chinese fonts.

to be simple:
as in my original msg: 【知乎】你的验证码是 698449，此验证码用于登录知乎或重置密码。10 分钟内有效。
the author already make sure that other people who know chinese will reasonably understand the message.
so you simply wrap it by the width of the screen, and make no sense for you to add empty spaces or modify it, unless you want to help the author to emphasis on something, which should not be the case.

Same as a string of number 8374018374018374018237401837083,
the author dont expect you to add empty spaces into it,
yet i guess he will expect that the string will be wrap by the width of the screen due to physical limitation.

thanks