它们是透镜，因为它们是凸面容器，当它们盛满水后，它们可作为透镜使用，你可以看到它们里面上下颠倒的地平线。
They're lenses because they're convex vessels, and when they're full of water, they act as a lens and you see the horizon in them, upside down and backwards.
我抓起一个盛满水的杯子。
然后他拿起那只小碗给那只白色的羊挤了些新鲜的奶，然后把盛满羊奶的碗放在方形的中间。
Then he took the little bowl and milked some delicious fresh milk into it from the white goat, and afterwards set the bowl in the middle of the square.
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