Therefore, it might be said that our position as to the etiology of primary glaucoma, as Iconceive it, is that at least four element s mayfigure in it, two of which are problematical andlargely hypothetical, and two of which are certain.

• 因此,可以这样说:关于原发性青光眼的病因,据我看来,至少有四个因素:其中有两个因素是有问题的和多半是假设的,但另两个因素是肯定的。