如 r"this is a line with \n" 则 \n 会显示，并不是换行。 字符串可以用 + 运算符连接在一起，用 * 运算符重复。 Python ...
Abstract: The demand for plastic becomes greater as the human population increases. Consequently, the over-accumulation of plastic waste has become a significant concern, leading to a major ...
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