| 单词 | atomic number 3 |
| 例句 | Scientists say it took three minutes following the Big Bang, 13.7 billion years ago, for the first three elements to emerge — helium, hydrogen and then trace amounts of lithium, atomic number 3. ‘I Don’t Believe in God, but I Believe in Lithium’ 2015-06-25T04:00:00Z |
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