A secret enemy had been continually by his side, under the semblance of a friend and helper, and had availed himself of the opportunities thus afforded for tampering with the delicate springs of Mr. Dimmesdale's nature.

一个秘密的敌人一直在他身边，打着朋友和助手的幌子，他利用这样的机会来篡改丁梅斯代尔先生天性中脆弱的源泉。