Only the arrowhead , carved from some milky blue stone, had any color.只有箭头, 是用乳状的蓝宝石雕刻的, 发出一些色泽.An arrowhead is never used at the radius center.箭头永远不可以指向圆心.Zig - zag line with arrowhead used to indicate a communication l...
Marie Curie’s remains were exhumed and interred in the Pantheon.玛丽·居里的遗体被移出葬在先贤祠中。At last came the day when Marie Curie was almost at the end of her efforts.这一天终于来临了,玛丽-居里的努力快见成效了!A metal called uranium gave off a kind o...