书城教材教辅科学读本(英文原版)(套装1-6册)
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第149章 第二册(66)

Cast-steel is easily fusible, like cast-iron, but it is malleable, and can be worked up at the forge like wrought iron. Cast-steel is used for making machinery and great guns.

Shear-steel is used for making cutting tools and springs. It is very elastic.

The Rabbit

"Come and see what father has given me for my birthday present," said Norah- "a pretty tame rabbit in a hutch. Isn"t it a beauty, boys? It is nearlyas big as our dear old Tabby, and, like her, it has a thick coat of soft warm fur.""It is really a beauty, dear," said Fred and Willie in one breath.

"Look at its long ears," Norah went on, "and they are so sharp. At the least sound up they go. And then its large, soft, gentle eyes. Look at them. Theyare very bright and sharp, although they are soft and gentle.""Do you see," said Fred, "that the rabbit"s eyes are placed at the sides of the face, not in front? In its wild state it has many enemies among the flesh-eaters. It is a timid little thing, and cannot fight them. It must get away as fast as it can.

The eyes are placed at the sides of the face to help it to see all round as well as in front.