You can use regular expressions to limit which characters are allowed and to be more specific (for example, you can often limit even further what the first character can be).
您可以使用正则表达式来更为详细地限制所允许的字符串(例如，您可以进一步指定第一个字符可以是哪些字母)。
The authors put the reader into their shoes, helping us to understand the social and economic constraints that often limit their ability to change their own lives for the better.
作者让读者设身处地，感同身受，帮助我们了解社会和经济的限制，这往往限制了他们改变自己的生活的能力。
Lever-type safety valve lever to rely mainly on the weight of the work force, but the lever-type safety valve size often limit the choice of scope.
杠杆式安全阀主要依靠杠杆重锤的作用力而工作，但由于杠杆式安全阀体积庞大往往限制了选用范围。
You can often limit aggravation (and harassment via multiple channels) by proactively informing colleagues about the best way to reach you, whether it's via phone calls, texts, emails, or even tweets.
你能够通过主动地告诉同事联系你的最佳方式，来减少伤脑筋的情况(以及多种渠道所导致的烦扰)，无论这一方式是电话、信息、电子邮件还是推特。
You can often limit aggravation (and harassment via multiple channels) by proactively informing colleagues about the best way to reach you, whether it's via phone calls, texts, emails, or even tweets.
你能够通过主动地告诉同事联系你的最佳方式，来减少伤脑筋的情况(以及多种渠道所导致的烦扰)，无论这一方式是电话、信息、电子邮件还是推特。
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