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Although he was not very confident ,but he accepted his frie

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Although he was not very confident ,but he accepted his friend's concentrasion to swim across a river.
是concentration,这个词应作何理解?
尽管他不是十分的有信心,但是他还是接受了他朋友的关注,要去游过这条河
(句子有错,后面的but要去掉,同时concentrasion也是错的)
补充:concentration是 n.集中; 专心; 关注; 浓度