You can put safeguards in place with external variables, but that would get messy very quickly.
可以利用外部变量采取安全措施，但这会很快引起混乱。
For controlling the greenhouse environment the first step is to set up a mathematical model which describes the relationship between the external variables and the plant environment.
实行温室控制的首要步骤是建立一个合理的数学模型，用该模型来描述温室外部变量和作物生长环境的关系。
Chapter 4 covers functions and program structure - external variables, scope rules, multiple source files, and so on - and also touches on the preprocessor.
第4章介绍函数和程序结构—外部变量、作用域规则和多个源文件等，并涉及到预处理器。
External variables allowing business process variables to be visible and directly manipulated outside process instance.
外部变量允许业务过程变量可见，并可以直接在过程实例之外操作。
External variables allowing business process variables to be visible and directly manipulated outside process instance.
外部变量允许业务过程变量可见，并可以直接在过程实例之外操作。
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