Suddenly there was the momentary gleam of a light up in the direction of the ventilator, which vanished immediately,
突然，从通气孔那个方向闪现出一道瞬刻即逝的亮光，
but was succeeded by a strong smell of burning oil and heated metal.
随之而来的是一股燃烧煤油和加热金属的强烈气味。
Someone in the next room had lit a dark-lantern.
隔壁房间里有人点着了一盏遮光灯。
I heard a gentle sound of movement, and then all was silent once more, though the smell grew stronger.
我听到了轻轻挪动的声音，接着，一切又都沉寂下来，可是那气味却越来越浓。
For half an hour I sat with straining ears.
我竖起耳朵坐了足足半个小时。
Then suddenly another sound became audible -- a very gentle, soothing sound,
突然，我听到另一种声音，一种非常柔和轻缓的声音，
like that of a small jet of steam escaping continually from a kettle.
就像烧开了的水壶嘶嘶地喷着气。

The instant that we heard it,
在我们听到这声音的一瞬间，
Holmes sprang from the bed, struck a match, and lashed furiously with his cane at the bell-pull.
福尔摩斯从床上跳了起来，划着了一根火柴，用他那根藤鞭猛烈地抽打那铃绳。
"You see it, Watson?" he yelled. "You see it?"
"你看见了没有，华生？"他大声地嚷着，"你看见了没有？"
But I saw nothing. At the moment when Holmes struck the light I heard a low, clear whistle,
可是我什么也没有看见。就在福尔摩斯划着火柴的时候，我听到一声低沉、清晰的口哨声，
but the sudden glare flashing into my weary eyes made it impossible for me to tell what it was at which my friend lashed so savagely.
但是，突如其来的耀眼亮光照着我疲倦的眼睛，使我看不清我朋友正在拼命抽打的是什么东西。
I could, however, see that his face was deadly pale and filled with horror and loathing.
可是我却看到，他的脸死一样地苍白，满脸恐怖和憎恶的表情。