Englishfor English speakers
specialist
Noun
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A specialist is a person who is highly skilled in one type of activity or study.
His army training had made him a bomb disposal specialist.
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A specialist is a doctor who is skilled in treating one part of the body.
It hurt so much when she swallowed food that she was sent to a throat specialist.
in
Preposition
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Used to show that something is inside something else.
The cat is in the box.
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Used to show that someone is at home, or is available.
Is John in?
The Doctor is now in.
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Used to show movement towards the inside.
The rain came in through the window.
didactics
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noun
(= education, instruction, teaching)
the activities of educating or instructing; activities that impart knowledge or skill
he received no formal education
our instruction was carefully programmed
good classroom teaching is seldom rewarded