n. the region that is inside of something
n. the inner or enclosed surface of something
a. relating to or being on the side closer to the center or within a defined space
s. being or applying to the inside of a building
n. 内部, 内脏, 内幕
a. 内部的, 秘密的, 户内的
adv. 在里面
prep. 在...之内