1. It is clear that the enemy has no desire for peace.
2. It is obvious (evident) that the success of the innovation depends on our concerted efforts.
3. Neither…nor
4. It is (has been) estimated that the world's population could reach 6 billion by the end of the century.
5. The mechanism by which brain cells store memories is not clearly understood.
6. Most substance contract when they freeze so that the density of a substance’s solid is higher than the density of its liquid.
7. The development of mechanical timepieces spurred the search for more accurate sundials with which to regulate them.
8. in order that
9. Recently the problem of…… has been brought into focus. =Nowadays there is a growing concern over……
10. ……已成为人的关注的热门话题,特别是在年青人当中,将引发激烈的辩论。
11. Anthropology is a science in that anthropologists use a rigorous set of methods and techniques to document observations that can be checked by others.
12. 现在,……,它们给我们的日常生活带来了许多危害。首先,……;其次,……。更为糟糕的是……。
13. What is more important, the agreement they have negotiated is being carried out.
14. Although pecans are most plentiful in the southeastern part of the United States, they are found as far north as Ohio and Illinois.
15. Anthropologists have discovered that fear, happiness, sadness, and surprise are universally reflected in facial expressions.
16. One…the other
17. either…or
18. Essentially, a theory is an abstract, symbolic representation of what is conceived to be reality.
19. Thanks to modern irrigation, crops now grow abundantly in areas where once nothing but cacti and sagebrush could live.
20. 俗话(古语)说,……:As an old saying goes/ As an old proverb says, ….
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