Something energy-efficient uses as little energy as possible to do its job. We say it of machines, lights, cars, houses, and ways of working.

Something energy-efficientenergy-efficient的東西 uses as little energy as possible to do its job會用盡量少的能源來完成它的工作。We say it of machines, lights, cars, houses, and ways of working我們會用這個詞形容機器、燈具、車子、房子和做事的方式。

An energy-efficient fridge still keeps food cold; it just takes less electricity. Shops and government ads in Taiwan talk about this a lot, because power costs money and people worry about waste.

An energy-efficient fridge still keeps food coldenergy-efficient的冰箱一樣能讓食物保持冰涼; it just takes less electricity只是用電比較少。Shops and government ads in Taiwan talk about this a lot台灣的店家和政府廣告很常提到這個, because power costs money and people worry about waste因為電費要花錢，人們也擔心浪費。

Careful writing usually keeps the hyphen (energy-efficient); you will also see it without one.

Careful writing usually keeps the hyphen (energy-efficient)講究的寫法通常會保留連字號（energy-efficient）; you will also see it without one你也會看到沒有連字號的寫法。

Though actually, efficient alone is not the same: a machine can save time and still waste power. This word is only about energy — electricity, fuel, heat — not about whether a person feels lively.

Though actually不過其實, efficient alone is not the same單獨的efficient意思不太一樣: a machine can save time and still waste power一台機器可以省時間，卻還是很耗電。This word is only about energy這個字只跟能源有關 — electricity, fuel, heat像電力、燃料、熱能 — not about whether a person feels lively而不是指一個人是否有活力。