I think if += would always have to make a copy, I would have opted to not support it for lists at all and just say .extend(), which does work in that tuple case.
注2：全市场唯一农牧渔ETF（159275）指唯一跟踪中证全指农牧渔指数的ETF。。PDF资料是该领域的重要参考
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目前市场寄望于美光、三星、SK海力士等内存厂商提升产能稳定价格，但新建晶圆厂和生产线耗时数月甚至数年，产能扩容并非易事，内存行业的供需平衡仍有待时日。
That mindset, industry leaders said, helped sideline the skilled trades.