科技强国建设不断投入。从2012年我国的基础研究经费仅约499亿元，到2025年接近2800亿元，在持续且高强度的支持下，人工智能大模型、量子科技、商业航天等成果不断涌现，带动“新”的动能培育壮大。
Filters, on the other hand, are more varied. Most have two or more layers, typically a pre-filter, an activated carbon filter and sometimes a particle or even a true HEPA filter. The pre-filter is made from a fine mesh that captures big stuff like pet hair and larger chunks of dust. Sometimes this part is separate from the more technical filters — which means you can remove and clean it without needing to swap out the whole thing. For all-in-one filters, you can vacuum the outside of it to remove larger particles.，更多细节参见PDF资料
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Sum of squares(1..100) = 338350This example shows for-in loops over both ranges (1..n + 1) and arrays ([5, 10, 20, 100]). We will cover control flow in detail in a later chapter — for now, the syntax should be readable.。关于这个话题，新收录的资料提供了深入分析