1. Sound example 3: John Challis piano with metal soundboard and bridge.
   良好的范例3：约翰查利斯钢琴与金属音效和桥梁。
2. Mark Challis is the manager of Belfast Zoo.He explained a bit more about Sheila's story.
   As it celebrates its 75th birthday the bosses have decided to try to identify 寻找 her.

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