目前尚不清楚究竟是哪一种风险因素——或更可能在多种因素的共同作用下，推动了青春期年龄的提前，也不清楚为何在不同种族和性别之间存在如此显著的差异。现有国内外研究普遍认为，青春期提前并非单一原因所致，而是多种因素叠加的结果，其中有三类因素被最多提及。
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The only other big upgrade is a bump from 8 GB of unified memory to 12 GB. This is a welcome change, as Apple hasn't increased the price of the base configurations. It also comes at a time during a memory shortage crisis, but despite this, the M4 iPad Air still starts at $599 for the 11-inch model and $799 for the 13-inch. Storage options start at 128 GB and max out at 1 TB.
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