For example, they were added in small quantities to ink, plastics, paints and carbon paper or were used in formulations of up to 70 per cent PCBs in hydraulic fluid, transformer fluid and heating fluids.
例如，将它们少量地加入墨水、塑料、油漆和复写纸中，或以多氯联苯高达70%的配方用在液压油、变压器油和载热剂中。