Describing Materials

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rigid = unable to bend or not stretching easily durable = not easily broken opaque = not able to be seen through, opposite to transparent hardness = the quality of how firm or solid smth is elastic = able to stretch easily lightweight = of thin material and opposite to heavy
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.