So the second option is rarely used in real-world system implementations.

所以在实际的系统实现中，第二个选项很少使用。

youdao

All three types of changes must be addressed to successfully model a real-world system.

要对现实世界系统建模，就必须处理好这所有3种变化类型。

youdao

“Game-ifying” a real-world system still requires more than just adding avatars and points. It requires fast, personalized feedback.

将现实世界这个系统“游戏化”需要的不仅仅是添加一个头像和分数，还需要快速且个性化的反馈。

youdao

The MAZ system brings the real-time world to print and the app.

FORBES: Connect

Despite the success of the euro, which has been worth more than the dollar ever since the U.S. economy busted in 2001, there's no real plan afoot to put the world on a one-currency system.

FORBES: Magazine Article

The real problem is an antiquated air-traffic control system "that is essentially based on World War II-era technology, " says Victoria Day, a spokeswoman with the Air Transport Association, the industry's lobby group.

NPR: Attention, Airlines: This Is Your Passenger Speaking