| 单词 | 人们早已知道 |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔catalyse〕It had been known for some time that chemical reactions can be catalyzed by materials with large surface areas.人们早已知道，如果材料的表面积足够大，可引起催化反应。柯林斯高阶〔combustible〕The ability of coal to release a combustible gas has long been known.人们早已知道煤能够释放一种易燃气体。柯林斯高阶 |
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