used in response to a failure or mistake: dang, shoot, darn it

sister city

a curtain (both literal, as in a window covering: “open the curtains to let in the light”, and figurative, as in a barrier: “the Iron Curtain”)

cat

Bamboo Curtain

a green wall (a wall covered by greenery)

緑のカーテン: a green wall (a wall covered by greenery)

shower curtain

iron curtain (a barrier that greatly hinders interaction or exchange)

a cat