一个虚拟的小费箱让艺术家可以从粉丝处收取额外的钱或为他们喜爱的事业筹集捐款。
A virtual tip-jar allows artists to collect extra money from fans or raise donations for their favorite cause.
只要玩家创造出一项发明，按下“Make”按钮，钱就会出现在他们的虚拟银行中。
Whenever a subject created an invention and clicked on the "Make" button, money would appear in their virtual bank.
然而玩家们仍然乐此不疲的用真正的钱去购买虚拟的农具。
Yet they are happy to swap real money for virtual money to buy virtual farm tools.
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