1. 在計算機程序設計中指執(zhí)行一次調用。
   In computer programming, to execute a call.
2. 用于修飾或說明一種進程或過程，它允許用戶調用它，而用戶并不用知道它的存在。
   Pertaining to a process, or procedure, invoked by a user without the latter being aware of its existence.
3. 在計算機安全學中，一種計算機程序，表面上或實際上有某種有用的功能，而含有附加的（隱藏的）可能利用了調用進程的合法特許來危害系統(tǒng)安全的功能。
   In computer security, a computer program with an apparently or actually useful function that contains additional(hidden) functions that surreptitiously exploit the legitimate authorizations of the invoking process to the detriment of security.

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