Number (2): Everything in this space must add up to 2. The answer is 2-1, placed horizontally; 1-4, placed vertically.
At its core, a stream is just a sequence of data that arrives over time. You don't have all of it at once. You process it incrementally as it becomes available.
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（二）在车辆、行人通行的地方施工，对沟井坎穴不设覆盖物、防围和警示标志的，或者故意损毁、移动覆盖物、防围和警示标志的；
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