VOA慢速英语:Toys That Make Music Are Hot This Year for Christmas Gifts

2.sensitive adj.易受伤害的, 易损坏的; 易受影响的; 敏感的; 过敏的
 
例句：The cost is not sensitive to the batch size.
      价格不因整批尺寸的变化而发生波动。

3.complex a.复杂的,合成的

例句：What he said was too complex for me to understand.
      他说的太复杂了, 我无法了解。

4.masterpiece n.杰作, 名作, 代表作, 名著

例句：This book is a real masterpiece.
      这本书是真正的名著。