| 单词 | 坚硬物质 |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔adamant〕An extremely hard substance.坚硬物质：极坚硬的物质美国传统Lasers are used for cutting hard substances such as metal and for performing delicate surgical operations.激光用来切割金属之类的坚硬物质，做难度高的精细手术。剑桥国际 |
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