Well, they come from the three principal ingredients of gunpowder, which are sulfur, charcoal and saltpeter.
嗯,它们来自火药的三种主要成分,即硫磺、木炭和硝石。
单词 | principal ingredient |
例句 |
原声例句
科学60秒-科学美国人 2019年8月合集 Well, they come from the three principal ingredients of gunpowder, which are sulfur, charcoal and saltpeter. 嗯,它们来自火药的三种主要成分,即硫磺、木炭和硝石。 |
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