demography

question, problem on homework etc. / a question; a matter (of time etc.) / a problem (something that needs to be dealt with); a trouble / an issue; a matter

a piece of research, a study, investigation

to research, to study

scholarship; learning; knowledge

器械: a device, an appliance, a mechanism / 機械: a machine, equipment, an apparatus / 器械: a utensil, a tool, an instrument / 器械: a tool for conducting a test or experiment or for measurement

arm / ability / talent

(anatomy) arm / ability; skill; talent

arm

adverbial form of よい (yoi, “good”) / adverbial form of いい (ii, “good”) / 良く, 善く, 克く: good, well / 良く: frequently, often / 良く, 善く: having astonishing ability or guts / 能く: (literary) able to