関連ワード:  what is mean by reference frame    what do you mean by reference frame in physics    what is mean by frame of reference in physics    what is the meaning of reference frame in telugu    what is mean by inertial frame of reference    what is meant by internal frame of reference    what is mean by non inertial frame of reference    what do you mean by reference frame    what is the definition of reference frame    which best describes a reference frame