The xylophone is a musical instrument. 木琴是一种乐器。

　　The xylophone is usually made of wooden bars. 木琴通常是由木条制作的。

　　These bars have all various length. 这些木条长短不一。

　　The different length make different sounds. 不同长度的木条发出的声音也不一样。

　　How are they different? 它们如何不同呢？

　　The longer bars make a lower pitch, the shorter bars make a higher pitch. 较长的木条发得音低，较短的木条发的音高。

　　We hit the bars with the stick to make music. 我们用棍子敲击木条来制作音乐。

　　This stick is made of wood too. 这根棍子也是由木头制作的。

　　The name of this stick is the mallet. 这根木棍叫做小音槌。