inside/ˌɪn'saɪd/

prep. in or into the inner part of (sth)

ad. in or to the inner part

prep. 在…里面；向…里面：What's inside the bag? 袋子里是什么？

ad. 在里面；朝里面：He opened the door and looked inside. 他打开门，朝里面看了看。

构词in + side

同根 alongside; aside; beside; hillside; inside; outside; seaside; sideroad; sidewalk; sideway; wayside