| 单词 | 一左 |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔COME FROM〕About a quarter of the drugs in prescription medicines today are derived from plants. 现在的处方药中，有四分之一左右是从植物中提取的。朗文写作活用〔volume〕A given volume of air contains only about one-third as much oxygen as it would at sea level.一定容积空气的含氧量只有海平面处空气含氧量的三分之一左右。外研社新世纪 |
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