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春节期间，手里难免沾上油烟、糖霜或者护手霜，手机镜头大概率是蒙着一层油污的。带着油污去拍照，所有的灯光都会变成乱七八糟的眩光，画面也是雾蒙蒙的，再精通后期也救不回来。所以，在掏出手机准备记录美好瞬间之前，先用衣服下摆或者纸巾，用力地、仔细地把镜头擦干净。
。51吃瓜对此有专业解读
The algorithm walks the tree recursively. At each node, it checks: does this node's bounding box overlap with the query rectangle? If not, the entire subtree gets pruned (skipped). If it does overlap, it tests the node's points against the query and recurses into the children.
防窥模式还有两档强度可调。打开第二档高强度防窥之后，屏幕基础亮度会略微降低，但侧看过去屏幕会黑得更彻底：