It is difficult to simulate natural phenomena such as: rain, snow, lightning etc in real-time in simulation system using FBM and L-system because they are irregular, dynamic and random.
雨、雪、闪电等自然现象因其具有不规则性、动态性和随机性，很难在仿真系统中用FBM方法和L -系统方法实现对它们的实时仿真。
It is difficult to simulate natural phenomena such as: rain, snow, lightning etc in real-time in simulation system using FBM and L-system because they are irregular, dynamic and random.
雨、雪、闪电等自然现象因其具有不规则性、动态性和随机性，很难在仿真系统中用FBM方法和L -系统方法实现对它们的实时仿真。
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