LEWIN Now, Peter decides at one point that instead of throwing the sandwich backwards, he can also throw the sandwich forward, because, look, we have here the red ellipse.
12点方向，三明治移动。，LEWIN：，12：00，，there，goes，the，sandwich。,现在Peter决定在一个点,而不是把三明治向后扔，他也可以向前仍，因为，看，公色的椭圆轨道。
LEWIN Now, Peter decides at one point that instead of throwing the sandwich backwards, he can also throw the sandwich forward, because, look, we have here the red ellipse.
12点方向，三明治移动。，LEWIN：，12：00，，there，goes，the，sandwich。,现在Peter决定在一个点,而不是把三明治向后扔，他也可以向前仍，因为，看，公色的椭圆轨道。
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