Well it can be just as frustrating for users when they're trying to buy something online and they don't know how many more steps are required before finally making the purchase.

对用户来说，当他们试图在线买点什么东西，如果他们不知道最终完成订购还需要多少步骤，他们会倍感挫折。

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You've already identified commerce as a required function and you have a commerce engine that allows a gamer to choose and buy a selection of T-shirts in different sizes and colors.

我们已经确定交易是必需的功能，而且已经有了一个交易引擎，玩家可以通过交易引擎选购不同尺码和颜色的t恤衫。

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This form of bead shopping will enable the purchase to buy as many single beads as are required in order to make a personal item of jewelry or other beaded item.

这种形式的珠子购买方式可以使购买者想买多少珠子，以便于定制个人珠宝首饰或其他镶嵌珠宝的物件。

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Any adult can buy a handgun after a brief background check (as required by federal law), and anyone who legally owns a handgun and who asks for a permit to carry a concealed weapon must be granted such a permit.

ECONOMIST: Americans still don't want more gun control

All users are thus required to contribute as much to the system as they consume either that, or buy some Mojo with real money.

ECONOMIST: Online file-sharing