There are some callbacks for variable system events such as memory warnings and the de-allocation.

代码中有一些对可变的系统事件（比如说内存警告和存储单元分配）的回调。

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Paper also point out the condition of system's transfer function that the time-variable system must require.

论文给出了要实现此双重保密功能，收发端时变系统的系统函数所要满足的条件。

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The kinetic energy theorem of mass variable system is derived from the kinetic equation of mass variable body.

从变质量物体的动力学方程出发，推导出变质量系统的动能定理。

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So, and of course, you know, keeping entropy as a fixed variable for a system like that is extremely cumbersome.

所以，对这样的系统要求它们的熵保持恒定,和一个非常笨拙做法。

麻省理工公开课 - 热力学与动力学课程节选

So the system will not be described by a single state variable during the path.

因此系统将不能被,路径上的单一状态变量描述。

麻省理工公开课 - 热力学与动力学课程节选

If I wanted to use print as a variable name, how do I get the system to decide gee, do I want print as a value for something, or do I want print as a command?

如果我把print当做一个变量名，我如何让系统来决定，我是要把print当做一个命令来用呢，还是要把它当做一个变量名来用呢？

麻省理工公开课 - 计算机科学及编程导论课程节选

Given a free hand in the design, his team developed a continuously variable transmission system that allows the petrol engine and electric motor to work separately or in tandem.

ECONOMIST: MONITORS: And the winners are... | The

Exams produce nice clear results, which can give useful clues about the performance of pupils, schools, teachers, methods and every other variable in the system.

ECONOMIST: Moves away from A-levels and GCSEs

We need to move away from this system dominated and characterized by the measure of time and other inputs in which we hold time as a constant for everyone and learning is variable to a competency-based learning system powered by digital learning in which time becomes the variable and student learning the constant and the system is based on outcomes.

FORBES: The Single Best Idea for Reforming K-12 Education