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重点讲解：
1. aim to do sth. 致力于；旨在；以…为目标；
They are aiming to reduce unemployment by 50%.
他们正力求使失业人数下降50%。
2. so far 迄今为止；到目前为止；
So far we haven't been able to find anything, but we're still researching.
目前我们还没有任何发现，但是我们仍在研究。
3. seek to do sth. 力图；想方设法；
He also denied that he would seek to annex the country.
他还否认会试图吞并该国。
4. take part in 参加；参与；
They returned to take part in the season's opening game.
他们回来参加本赛季的开幕赛。
