即使校验失败，应用程序通常因符号的语法错误而终止——符号一般来说不是合法值——这也时额外的安全机制。
Even if this verification fails, the application will usually break due to syntax errors - tokens are usually not valid values - which provides an extra "fail-safe" mechanism.
目的：为阐明瓦氏动作在终止室上速过程的作用机制。
Objective: to expound the mechanism of Valsalva maneuver to treat supraventricular tachycardia.
两个星期前启动的新机制，终止了成千上万的外国人以假留学方式到英国来劳务。
The new regime came in two weeks ago and is intended to end a scam in which thousands of foreigners enrolled at bogus colleges to work here.
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