平均值下滑的省份共有5 个且分布较为随机，未能与总规模保持同步增长，表明披露研发人员的企业数量增长更快。以排名靠前的河北为例，企业数量的增幅（35.59%）超过了研发人员数量的增长（29.50%），从而拉低了平均值。
When Amazon first showed off its redesigned Fire TV OS at CES, we were impressed. It’s faster, better organized, and feels similar to Google’s top-notch TV interface. The update is now finally rolling out to the Amazon Fire TV Stick 4K Plus, making it an even better buy now that it’s on sale for $29.99 ($20 off) at Amazon, Best Buy, and Target — $5 shy of its best price to date. If you want something cheaper and don’t mind waiting for the update to arrive, the Amazon Fire TV Stick 4K Select is also on sale at Amazon, Best Buy, and Target, for $19.99 ($20 off), which is $2 more than its all-time low price.
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去年，我注意到一个有些反直觉的现象。
This was not the first time that microbiologists experienced problems with agar. A phenomenon called “The Great Plate Count Anomaly” baffled researchers in the early 20th century when they observed that the number of cells seen under a microscope didn’t match the actual number of colonies growing on an agar plate. Investigating this discrepancy, researchers found agar itself to be the culprit: when nutrient broths are heated with agar during boiling, harmful byproducts (hydroperoxide) can form due to the reaction of agar with phosphate minerals contained in the media. Researchers can avoid this by autoclaving agar separately from the nutrient broth, or by reducing the amount of agar used.
Quadtree-based image compression formats and level-of-detail systems all work this way. Satellite imagery, terrain rendering, and geographic information systems use quadtree decomposition to serve data at varying resolutions: zoomed out, you see large coarse blocks; zoomed in, you see fine-grained tiles. The same principle extends to three dimensions (octrees) for volume rendering and 3D spatial indexing.