一种床垫里充水的床waterbed

• 北京的大商场里，售价几千元钱的水床引起了人们的注意。

  In large department stores in Beijing, waterbeds with a price tag of several thousand yuan have attracted attention.

• 水床特殊的原理会让人在夏天时感觉很舒服。

  The special principles underlying waterbeds help people feel cool in summer.