show me the letter,please.which one?the one in/by pencil选择原因

问题描述:

show me the letter,please.which one?the one in/by pencil选择原因
in ink有这样的说法吧,in用什么材料

by 意思是在这只铅笔旁边
IN 是在铅笔里面,哪有信在铅笔里面的~!