It can also be hard to interpret the results of testing finished products that contain lots of ingredients.
在这些头部企业之外，中国还有数量更为庞大的科创主力军。
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It comes after Heraeus Medical, the main supplier of bone cement to the health service, has had to temporarily halt production at its main site affecting supply for up to two months.
Image caption, Leigh-Anne Pinnock told BBC Bitesize about fake news she had read about herself
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