A: Actually, what the interferometer measures is the difference between the lengths of the two arms.
A: Actually, what the interferometer measures is the difference between the lengths of the two arms.
答：实际上，干涉仪测量的是两臂长度之差。
A: Actually, what the interferometer measures is the difference between the lengths of the two arms.
答：实际上，干涉仪测量的是两臂长度之差。