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Angielski techniczny
tropical diseases, infectious disease, costly investment, unsightly, runoff, contain, mechanical stirrer, harmful material, to suffocate, comprise, to decompose, analytical balance, soluble, distant, exiccator/desiccator, desert, harm, sieve shaker, to trace, solid particles, graduated pipette measuring, expose, separation, worldwide problem, soot, trace amounts, calibrated pipette, industrialized areas, a source, exhaust, enlarge, remote area