【効率】
❶an energy-efficient appliance - My washing machine is an energy-efficient appliance. It's very eco-friendly.
省エネ家電
❷a fuel-efficient vehicle - The new Toyota is a very fuel-efficient vehicle. I can drive long distances with only a little bit of gas.
燃費のいい車
❸work efficiently - Working efficiently in a small amount of time is much better than working long hours with little productivity.
効率的に働く
❹manage the time efficiently - I get a lot of work done, since I manage the time efficiently.
時間を効率的に使う