(sep-v.) lose efficacy, lose effectiveness, be no longer in force, become invalid
(prep./n.) separated in time (followed by a quantity of time); time interval
(idiom.) speak the plain truth, tell the truth, not beat around the bush
(n.) season (marked by certain weather conditions, etc); occasion, particular time
(n.) substance, entity; something that is substantial, real or physical
(v.) to order (someone) about; to use, to handle (oral Chinese)
(v./n.) place where an experience is made; launch a pilot project, conduct tests at selected points