February has been a turbulent month for DJI. The Chinese tech giant, best known for making drones, escalated its fight against the U.S. drone ban by suing the FCC. Then the internet erupted over an entirely different DJI device: The Romo robot vacuum.
在理想模型中，如果一台机器人月均能接十单，每单两三千元，半年左右即可回本。这种测算足以让许多人产生强烈的参与冲动。
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- satisfiable: Boolean. True if the formula is satisfiable