Englishfor English speakers
spontaneously
Adverb
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If something happens spontaneously, it happens randomly or suddenly.
broken
Adjective
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something that is broken is not as it should be because it has been damaged or injured
The broken cup lay in pieces on the floor.
After the crash his arm seemed broken.
A broken stone is apart(in more than one piece).
symmetry
Noun
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A balance or harmony of parts.
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A division of the body would produce two parts which are mirror images of each other.
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An arrangement of parts around a central point.
An orange has symmetry: it is a sphere with segments arranged around a common central line.
The segments of an orange show symmetry: their shape and relative positions are the same.