A few minutes later they heard a long low whistle. Immediately Holmes jumped up from the bed and struck a match with his stick he hit the bell rope again and again with heavy blow.

• 几分钟后，他们听到一声长长的低沉的口哨。福尔摩斯立即从床上跳起来,划燃一根火柴，用手杖一次又一次重重地敲打着铃绳。