| 1. | It has long been known that the hunting scene depicted on walls were not simply a form of artistic expression .
描绘在墙壁上的狩猎场面，不仅是艺术的表现形式，这一点早为人们了解。 |
| 2. | It has long been known that the key topic of discussion at the g8 summit will be energy security
分委会会议上就考虑科技合作的一系列新方向达成了协议。 |
| 3. | It has long been known that folic acid plays an important role in the production of normal red blood cells
很早以前，人们就发现叶酸对红血球的产生起着很重要的作用。 |
| 4. | It has long been known that schizophrenia often runs in families , but solid and direct links to heredity hae been elusie
人们早就知道精神分裂症常常是家族性的，但要在遗传学上找出确凿而又直接的联系一直困难重重。 |
| 5. | It has long been known that schizophrenia often runs in families , but solid and direct links to heredity have been elusive
人们早就知道精神分裂症常常是家族性的，但要在遗传学上找出确凿而又直接的联系一直困难重重。 |
| 6. | As a matter of fact , it has long been known that even during the most prosperous periods there have been people without enough to eat
这就是为什么一九六一年肯尼迪总统在他的就职演说中说： “如果政府不去帮助穷人，它也就救不了富人。 ” |
| 7. | In fact , it has long been known that exit polls , though they may claim to be based on random samples , suffer from biases in the way that they are conducted
其实长期以来出口人数统计虽说是随机抽样，因为操作方法仍会产生偏误，这是众所周知的问题。 |
| 8. | The researchers ' starting point was that it has long been known that singing is not top of boys ' wish lists , a reason commonly given being that boys do not want to " sound like girls "
研究人员的出发点是，唱歌长期以来被认为不是男孩喜好名单的首选，而解释的理由通常是，男孩子不想听起来像女孩子。 |
| 9. | It has long been known that different individuals in a population respond to the same drug differently ， and that these variations are be due to variations in the molecular receptors being affected by the drug ， or to differences in metabolic enzymes that clear the drug
人们早已知道人群里的不同人对同一种药物的反应不同，这是受药物影响的分子受体的不同或清除药物的代谢酶的差异造成的。 |
