What I dreaded was I, being at my grimiest, should see Estella looking in.

我所担心的是当我正干着最肮脏的活儿时，突然看到埃斯苔娜向里面张望。

What I dreaded was, that in some unlucky hour I, being at my grimiest and commonest, should lift up my eyes and see Estella looking in at one of the wooden windows of the forge.

我所担心的是，在某个倒霉的时刻，我正干着最肮脏和最粗俗的活儿时，突然举目一望就发现埃斯苔娜从铁匠铺的木窗外向里面张望。