Wave

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wave = oscillation(=movement back and forth in a regular rhythm) caused by a disturbance; as it propagates(=transmits) through a medium (mechanical waves) or a vacuum (electromagnetic waves), it carries energy

mean = occupying a middle position : intermediate in space, order, time, kind, or degree


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trough [trÉ’f]

EFL subset that concentrates more on language in context than on grammar and language structures. It covers topics from accounting or computer science to tourism and business management. "Specific" means the studying through a field that is already known and relevant to a student.