穹

qióng = qu + (e)ng2

vault / dome / the sky

穹 character breakdown

穹
- 弓
- 穴
  - 八
    - 丿
    - ㇏
  - 宀
    - 丶
    - 冖

弓

go̅ng = gu + (e)ng1

surname Gong

弓

go̅ng = gu + (e)ng1

a bow (weapon) / CL:張|张[zhang1] / to bend / to arch (one's back etc)

Mnemonic symbol: a composite bow. Gitta Giraffe (gu) is shooting arrows with a composite bow (弓) in front of the engine ((e)ng1).

穴

xué = xu + e2

cave / cavity / hole / acupuncture point / Taiwan pr. [xue4]

穴 = 八 + 宀 : Xu Xian presents his newest piece of art: Cave paintings painted on a gigantic eight-ball. Somehow he managed to set it up inside the elevators entrance. For his great artistic achievement, he gained a honorary doctor, and proudly wears his hard earned graduation cap.