plead的过去式及过去分词;
英文例句/中文翻译：
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本文中制备的具有梯度结构的聚合物发光器件发出光的强度，比用旋涂法和真空喷雾法所制备的单纯高分子发光器件和混合结构的高分子发光器件更高。
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近年来，PLED（聚合物发光二极管）和a-Si TFT（非晶硅薄膜晶体管）技术取得了巨大进展，两者的结合有望成为未来平板电视的主流。
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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
By CGTN AfricaThe European Union pledged on Thursday 95 million US dollars to help fund relief operations for the hundreds of thousands of refugees that continue to stream into Uganda from neighboring South Sudan.Th
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