| 单词 | 火山玻璃 |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔obsidian〕A usually black or banded, hard volcanic glass that displays shiny, curved surfaces when fractured and is formed by rapid cooling of lava.黑曜岩：火山玻璃，一般为黑色，带状，摔碎时色泽光亮，表面变曲，由火山熔岩迅速凝而成美国传统〔pitchstone〕Any of various volcanic glasses distinguished by their dull pitchlike luster.松脂石：某种火山玻璃，以其暗似沥青的光泽而著名美国传统〔volcanic glass〕Natural glass produced by the cooling of molten lava too quickly to permit crystallization.火山玻璃：熔岩迅速冷却以结晶状形成的天然玻璃美国传统 |
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