I believe, and I may be wrong in this so anybody can chime in, 1 large egg in the U.S. = about 1/4 cup in volume.
But let's face it. Water in China just isn't as wet as it is in the U.S.
Oh wait, there is no added water in the tollhouse recipe.
Wll, there goes that explanation.
Seeeeeeya; Chief Longwind of the North