美国，我们不能回头。
This is the scientific method, and once started on this line we cannot turn back.
这是科学方法。一旦开始按照这种方法去做，我们就不能走回头路了。
我们不能够折回。
我们不能倒退。
We cannot walk alone. And as we walk, we must make the pledge that we shall always march ahead. We cannot turn back.
我们不能单独行动。当我们行动时，我们必须保证勇往直前。我们不能后退。
We cannot walk alone. And as we walk, we must make the pledge that we shall always march ahead. We cannot turn back.
我们不能单独行动。当我们行动时，我们必须保证勇往直前。我们不能后退。
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