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如up to these few days/weeks/months/years,this morning/week/month/year,just,today,up to present,so far等：
Peter has written six papers so far.
彼得写了六篇论文，到目前为止。
Man has now learned to release energy from the nucleus of the atom.
人们现在已经学会了从原子核中释放能量。
There has been too much rain in San Francisco this year.
今年以来旧金山雨水太多。
The friendly relations and cooperation between our two countries have been enhanced in the past few years.
我们两国之间的友好合作关系在近几年得到了提高。
Up to the present everything has been successful.
到现在为止一切都是成功的。
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