问题描述：
这里的tip jar是什么意思
Before leaving the office, he had dumped what change
remained to his desk mug into his pocket. He counted it out
while waiting and concluded that he had just enough for a
basic coffee, medium size, with a little left over for the tip
jar.
Before leaving the office, he had dumped what change
remained to his desk mug into his pocket. He counted it out
while waiting and concluded that he had just enough for a
basic coffee, medium size, with a little left over for the tip
jar.
问题解答：
我来补答展开全文阅读