1. After buying a new chain I was faced with the insurmountable task of putting the confusing jigsaw puzzle together again.
    我买了一条新链子之后，便面临着一个难以克服的任务：把这个使人眼花缭乱的“益智分合图”再从新组合起来。

2. After buying a new chain I was faced with the insurmountable task of putting the confusing jigsaw puzzle together again.
    我买来一根新链条后，面临的就是如何把这些令人眼花缭乱的拼板重新组装起来。