Stay curious. Look closely.保持好奇，认真看世界。
Start with a question or an observation. Make complex ideas clear, and keep the details worth noticing.从具体的问题与观察出发，把复杂的原理讲清楚，把值得留意的细节记录下来。
A matrix multiplication selects an implementation for its device and, when gradients are needed, records dependencies for the backward pass.一次矩阵乘法先选择设备上的实现；需要求导时，还会记录依赖关系，供反向传播使用。
The eye forms an image; the retina converts light into electrical responses and processes color and contrast before signals reach the brain.眼睛先成像，视网膜再把光转成电信号；神经回路提取颜色与对比，传向大脑。
From Shantou’s arcades to Nan’ao’s coast, then Chaozhou’s bridge, old streets and lingering flavours.从汕头的骑楼走到南澳的海边，再去潮州看桥、逛街、尝一碟咸鲜。
A worked force-allocation model: longitudinal capacity, directional yaw reserve, actuator delay and reallocation after capacity loss.用同一受力模型计算纵向能力、方向性偏航余量、执行器延迟，以及能力下降后的重分配。
Buying hardware replaces a recurring API bill with upfront and running costs. Work out monthly savings first, then check whether they repay the investment in time.买机器能否省钱，取决于每月少付的 API 费能否覆盖运行成本，并在设备淘汰前收回初投。
A regulator can hold thrust steady while the tank cools and consumes gas faster. Work backward from a one-second pulse to storage, flow capacity and refill cost.稳压可以保持推力，却挡不住罐内降温与耗气加快。从一秒脉冲反推储气、供气能力和补气代价。
Memory decides what fits; bandwidth and software decide how it runs. A practical guide to hardware choice, local serving and acceptance tests.内存决定能装什么，带宽与软件决定如何运行。从预算、部署到验收，给出能落地的本地大模型选型方法。
Derivations, experiments, and moments worth keeping.推导、实验，还有值得留下的片刻。
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