n.物质( substance的名词复数 );实质;物体;[哲学]1)。 本质;
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Even innocuous substances can sometimes register a positive result in a drug test.
即使无害的物质在药物测试中有时也会呈阳性.
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Ink, dye, bleach, wax and toxic chemicals: These are just a few of the substances that have been found recently in food products in China, reigniting fears over food safety despite repeated government pledges to crack do
Human medicines and household substances have been discovered in the blood of green turtles in Australia's Great Barrier Reef, researchers said Friday, highlighting the impact of man-made matter on marine life.Medica
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