主意英文前加a还是an（表示方向的英语用at还是in）

前加an，例如：

1.Hey, that's an idea! And we could get a band, as well.嘿，好主意！而且我们还可以找支乐队。

2.He was about to shut the door when an idea came to him.他正准备关门，突然想到一个主意。

3.It might be an idea to detox after the indulgences of Christmas.圣诞节一番放纵之后排排毒或许是个不错的主意。