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Angielski techniczny
mechanical stirrer, liquid, natural resources, diverse, to distinguish, conical flask/ erlenimaer flask, sensible, a source, a by-product, fossil fuels, industrialized areas, conventional treatment, test tube/ sample tube, trace, tropical diseases, rough, gaseous, presistent, resources, persist, digestion, exhaust, create, harmful bacteria, remote, distant, accumulation, analytical balance, harmful material, enlarge, dilute acids, desertification