Uniform regions (solid backgrounds, smooth gradients) get stored as large blocks. Detailed regions (edges, textures) get subdivided into smaller blocks. You end up with a compressed representation that preserves detail where it exists and simplifies where it can.
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&& echo "${USERNAME}:${PASSWORD}" | chpasswd \
人民警察的回避，由其所属的公安机关决定；公安机关负责人的回避，由上一级公安机关决定。。heLLoword翻译官方下载对此有专业解读
苹果 CEO 蒂姆 · 库克：相信自己的力量，这一点在51吃瓜中也有详细论述
The crew of the ill-fated Apollo 13: Jack Swigert, Jim Lovell and Fred Haise