(aerospace) satellite; (astronomy) satellite; moon; CL:顆|颗[ke1]

bathroom; toilet; WC; CL:間|间[jian1]

guard; bodyguard

hygienic; sanitary; hygiene; sanitation

guard (i.e. group of soldiers)

(name) David

to stand guard over; (security) guard

to guard; to defend

to defend; to safeguard

to defend; defensive; defense