欢迎猜谜

朋友最近给我猜一道谜语，真是想破头脑。。。

to make it straight, she pulls it,
to make it stand, she rubs it,
to make it stiff, she licks it,
to make it in, she pushes it.

如果要翻成华语，我想就是这样：

拉它让它直
揉它让它站
舔它让它硬
推它让它进

所以这个“它”究竟是什么东东。。。猜到起笑，就点击评语看看里面提供大家的线索，声明这只能是达文奇式的间接性线索哦！