public override string ToString(FormatType format, object supplement = null)
{
switch (format)
{
case FormatType.Brief:
return($"{Id}.{Word} [{Abbreviation}]");
case FormatType.Detail:
return($"{Id}.{Word} [{Abbreviation}]{Pinyin?.BeIfNotWhiteSpace($"\n拼音：{Pinyin}")}{Explanation?.BeIfNotWhiteSpace($"\n解释：{Explanation}")}{Derivation?.BeIfNotWhiteSpace($"\n来源：{Derivation}")}{Example?.BeIfNotWhiteSpace($"\n例子：{Example}")}");
}
return(null);
}