| 词汇 | helmet |
| 词根词缀 | 词源： 1470, from M.Fr. helmet, dim. of helme "helmet," from Frank. *helm (cf O.H.G. helm "helmet"), from P.Gmc. *khelmaz, from PIE *kel- "to cover, to hide" (see cell). O.E. had helm, but it never was an active word. 词根记忆： n. 头盔,钢盔Which method of making the metal helmet is more economical in total?生产这种金属头盔的方法哪一种总体上更节约? |
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