Englishfor English speakers
tail
Noun
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A tail is a long, thin part on the back end of an animal.
The dog wags his tail (moves his tail quickly from side to side) when he sees his friend.
tail
Verb
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If you tail someone, you follow them without them noticing; you observe them.
element
Noun
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An element is one part of something bigger, such as a plan, an engine, or a business.
He's the best salesman on our team, but he's only one element in our success.
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An element is one basic kind of substance, such as iron (Fe) oxygen (O) or sodium (Na).
Water is made up of two elements: Hydrogen and Oxygen.