(proscribed) Alternative form of Zhongnanhai

(obsolete, proscribed) Alternative form of Chung-nan-hai

(pathology, astronautics, Apollo Program, informal) A condition caused by irritation to the eyes, nose, throat, and lungs, from exposure to highly abrasive lunar dust.

(literally, agriculture) To make hay during favourable (dry) weather. / (idiomatic) To act while an opportunity exists; to take action while a situation is favorable.