As I opened my door I seemed to hear a low whistle, such as my sister described, and a few moments later a clanging sound, as if a mass of metal had fallen.

• 我打开门的时候似乎听到一种低沉的口哨声，正如我妹妹描述的那样，过了一会儿，是当当的声音，似乎是很多金属落到地上。