(古生)板足鲎目的：一种巨大的、有节的，属于板足鲎目的水生节肢动物，生存于奥陶纪到二叠纪时期。
Eurypterid: any of various large segmented aquatic arthropods of the order eurypterida that existed from the ordovician period to the Permian period.
水面的反射，从大海到鱼缸或浴缸的水。人们的脸孔互相叠生。
Reflects on water, from the sea to the water in an aquarium or in a bathtub. Faces of people are superposed one on another.
下三叠统海相烃源岩是下扬子区最有利的烃源岩，陆相沉积也具有一定的生烃潜力。
The Lower Triassic Marine source rock is the most favorable one in the Lower Yangtze area, and the continental deposit has certain hydrocarbon generating potential.
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