He looked up, —at first with a stern, keen glance, which penetrated at once into the obscurity behind the arched window, —then with a smile which might be conceived as diffusing a dog-day sultriness for the space of several yards about him.

起头来，——起初用严厉而敏锐的目光，立刻穿透了拱形窗户后面的黑暗，——然后带着微笑，这微笑可以被认是在周围几码的空间里散发着三伏天的闷热。 .

After such a revelation, let him smile with what sultriness he would, he could much sooner turn grapes purple, or pumpkins yellow, than melt the iron-branded impression out of the beholder's memory.

让带着想要的那种闷热的微笑， 很把葡萄变成紫色， 或者把南瓜变成黄色， 而不是从旁观者的记忆中融化铁烙印的印象。