The compilation process occurs when the method is actually run, and the compilation techniques employed depend on analysis of the actual method during execution.
JIT编译是自动执行的。在实际运行方法时执行编译过程，采用的编译技术取决于执行期间对实际方法的分析。
A similar but more subtle problem emerges when user-defined class loaders are employed: the class we actually call may not be the one we expected to call.
类似的，当开发者使用自己的类加载器的时候，一个更微妙的问题就发生了：我们实际调用的那个类可能不是我们期望的那个类。
When a hardware cursor is employed, the pixels of the mouse cursor do not actually exist in the frame buffer because the hardware is responsible for performing the overlay.
硬件游标采用时， 鼠标光标的像素并不实际存在于帧缓冲区因为硬件负责执行覆盖。
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