英语翻译In particular,defining a body frame in which t

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In particular,defining a body frame (in which to intuitively model external motion in the world) is difficult.
in which后面接状语从句to intuitively model external motion in the world(此处不是一个完整的句子)修饰a body frame
======以下答案可供参考======
供参考答案1:
你可以理解为To model external motion in a body frame. But in particular, the defining the frame in the world is difficult.
in which在身体框架内直观的模拟外部运动。