空符号是相对于有声有色有定形的实符号而言。
The empty sign is opposite to the vivid, real, fix-formed sign.
记住名单甚至是一串名字的简易方法有连接方案，号码定形方案和号码押韵方案。
Some easy ways to remember lists, even if it is a list of names include link, number shapes or rhyme systems.
贴士：花园不一定要圈起来有固定形状才漂亮。莫奈的花园按颜色种植花卉，并且任由花卉自由生长。
Tip: a garden doesn't need to be constrained to be beautiful. Claude Monet planted flowers according to their colors and left them to grow freely.
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