underground
Definition
Beneath the surface of the earth; also refers to something hidden or secret.
日本語 地面の下、または秘密のもの
Example
"The subway system runs through a network of underground tunnels."
Beneath the surface of the earth; also refers to something hidden or secret.
日本語 地面の下、または秘密のもの
"The subway system runs through a network of underground tunnels."