| 单词 | biological system |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔billions〕Biological systems have been doing this for billions of years.生态系统亿万年来一直都是这样。外研社新世纪〔billion〕Biological systems have been doing this for billions of years.生物系统亿万年来一直都是这样。柯林斯高阶〔say〕To see the problem here more clearly, let's look at a different biological system, say, an acorn.为更清晰地理解此处的问题，我们来看一种不同的生物系统，比如说，橡子。柯林斯高阶 |
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