to speak; to say; a theory (usually in compounds such as 日心说 heliocentric theory)[cedict]
只管
zhǐ guǎnㄓˇ ㄍㄨㄢˇ
solely engrossed in one thing; just (one thing, no need to worry about the rest); simply; by all means; please feel free; do not hesitate (to ask for sth)[cedict]