Although he was not very confident ,but he accepted his friend's concentrasion to swim across a river.
问题描述：
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？
答
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