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What is the difference?
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man made vs. artificial
the words mean the same thing, but collocate with different words, i.e. we say 'artificial intelligence' and 'man-made lake'
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from the beginning vs. from scratch
'From the beginning' refers to states and processes; 'from scratch' refers to products and other tangible results
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help vs. aid
'aid' is slightly more formal than 'help'
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back then vs. the other day
back then: a particular time in the past that you are talking about; the other day: the recent past or a day that occurred close to the present day
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modern vs. state-of-the-art
'modern' is more general; 'state-of-the-art' is used for talking about cutting edge technology
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butterfly vs. moth
moths are less colorful and fly at night
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hand-made vs. man-made
hand-made is manufactured by hand; manmade is created by a human
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clean vs. pure
'clean' means 'not dirty', 'unusued' 'pure' means 'untainted', 'not mixed'
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copy vs. replicate
'copy' is more general; 'replicate' is more formal and is normally used in scientific and technical contexts
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progress vs. advancement
'advancement' is a countable noun; progress can be used as a verb or an uncountable noun
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glow-in-the-dark vs. bioluminescent
'glow–in–the–dark' can describe artificial light; 'bioluminescent' is natural
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reproduce vs. breed
'breed' is only used to talk about animals
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ongoing vs. in progress
'ongoing': when something isn't finished and will continue for some time; in progress: when a task is underway and will finish in the near future
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