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重点讲解：
1. come up with 想出，提出(计划、想法等)；
No one has come up with a definitive answer as to why this should be so.
对于为什么应该是这样，还没有人想出最终确定的答案。
2. focus on 集中(注意力)；关注；
The talks will focus on economic development of the region.
会谈将着重讨论该地区的经济发展。
3. dry up (使)枯萎；(使)干透；
The fountain is reputed never to dry up.
这口泉号称从不干涸。
4. take up 占领，占据，占有(位置、阵地)；
He had taken up a position in the centre of the room.
他占据了房间中心的位置。
n. 干燥
