intelligence; the ability to think
知性; 思考する能力 (chisei; shikou suru nouryoku)
"Use your grey matter to solve the puzzle."
"パズルを解くために知性を使ってください。" (Pazuru o toku tame ni **chisei** o tsukatte kudasai.)
to manage an organization or group efficiently and strictly
to do everything possible to achieve a goal
the most vulnerable or insecure part of a system
a person or group that is trusted and reliable
something very complicated or difficult to understand
to have an extremely analytical and efficient mind