append uses a small, stack-allocated backing store as the first
刘年丰：传统的巡检只能“看”，发现问题后还得派人去解决。我们的目标是巡检加操作——巡检到点位后，直接完成操作，比如掏钥匙开柜门、按开关、拔插头。
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Rendering a character as a lower block and then as an upper block gives you two “frames” of motion within the same character and looks much smoother.