An alloy steel that remains hard at a red heat; used to make metal-cutting tools.

能在高热下保持坚韧的合金钢，用于制造金属切削工具。

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Jack, a tall and thin chap with red hair, who leads a church choir, is as hard as steel and acutely self-conscious.

杰克，红头发、瘦高个儿，教堂唱诗班的领队，一个意志坚定、极端自我的男孩。

youdao

Jack, a tall and thin chap with red hair, who leads a church choir, is as hard as steel and acutely self-conscious.

杰克，红头发、瘦高个儿，教堂唱诗班的领队，一个意志坚定、极端自我的男孩。

youdao