Englishfor English speakers
sustainable
Adjective
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If something is sustainable, it can be continued for a long time, especially without using up resources.
The oil-based lifestyle of today is not sustainable.
The government is trying to balance sustainable development with economic growth.
safety
Noun
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When something is safe or secure
It is important to learn traffic safety so you do not get hurt while crossing the street
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Something that keeps a device from accidentally going off
It is important that the safety be on the curtain so that it does fall and hurt the actors
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In American football, the player on defense who is furthest from the ball at the start of the play.