lubricant

periodic

mechanical / like a machine; systematic / like a machine; robotic

machine; machinery

needed, necessary

need, necessity

fixed period / Short for 定期乗車券.

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

a target, a mark, a bullseye / an objective, an object (of doing something)

as far as ... is concerned; in terms of ...