But it turned out the oval marked the former course of a long-gone river, and when he zoomed in, he found the rectangles were buried structures.
但事实证明，这个椭圆形标记着一条长河的上游段，当他放大镜头后，他发现那些矩形是隐藏的构造。
When they examined these specimens using an electron microscope, they found that both were full of oval structures one or two microns long, which they suspected were melanosomes.
他们用电子显微镜检查标本时，发现两个标本都充斥着1或2微米长的椭圆结构。
He went to investigate and found a shiny object the size of a sedan perched on the hilltop, which was oval in shape and aluminium in color.
他走过去想一探究竟，发现在山顶处有一个轿车大小的发光物体，椭圆状，呈金属铝的颜色。
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