a cake of soap的用法和样例：
- There is a cake of soap in the box .
- She washed her hands with a cake of soap.
- There is a cake of soap in the box.
- A cake of soap doesn't cost much.
- On the sink was a cake of soap on the marble top.
- Men like to pursue an elusive woman, like a cake of wet soap in a bathtub- even men who hate bath.