在这种情况下，我们需要将这无限的区域截断成有限的区域来进行数值计算。
In this case, we need to truncate the domain to obtain a finite domain for performing numerical calculations.
1995年，作为无限期地扩展《不扩散核武器条约》的部分代价，埃及答应帮助在中东地区建立一个无核武器区域。
In 1995, as part of the price for extending the NPT indefinitely, Egypt extracted a promise to help set up a zone free of nuclear weapons (and other weapons of mass destruction) in the Middle East.
只在无限网络覆盖区域内使用智能手机查收电子邮件，以避免高额的网络连接费用，特别是当你在国外旅行的时候。
Avoid the high cost of being connected via your smartphone by only checking your email in Wi-Fi zones, especially when traveling overseas.
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