n.(所提及的)单项物，单个的人，单身男子(或女子)，(非孪生的)单生儿，单生幼畜

原形：singleton复数：singletons

In computer programming, a singleton is a design pattern that restricts the instantiation of a class to one object.
在计算机编程中，单例是一种设计模式，它限制一个类只能实例化为一个对象。
Singletons are often used in software engineering to manage resources that need to be shared across multiple objects.
单例在软件工程中常用于管理需要跨多个对象共享的资源。
The singleton pattern ensures that only one instance of a class exists and provides a global point of access to it.
单例模式确保类只有一个实例，并提供全局访问点。
In a distributed system, a singleton can be used to coordinate actions across different nodes.
在分布式系统中，单例可用于协调不同节点上的操作。
Using a singleton can simplify the code by avoiding the creation of multiple instances of the same class.
使用单例可以通过避免创建同一类的多个实例来简化代码。
A disadvantage of the singleton pattern is that it can make testing more difficult, as it creates global state.
单例模式的一个缺点是它会使测试变得更困难，因为它创建了全局状态。
Singletons are often criticized for promoting bad design and making code harder to understand and maintain.
单例常常因其促进不良设计和使代码更难理解和维护而受到批评。
In some cases, a singleton may be replaced with a factory or dependency injection to achieve similar functionality.
在某些情况下，单例可能被工厂模式或依赖注入所替代以实现类似的功能。
When using a singleton, it's crucial to ensure thread safety in multi-threaded environments.
在使用单例时，在多线程环境中确保线程安全至关重要。
Singletons can be useful in scenarios where you want to control the lifecycle of an object and limit its accessibility.
当你想要控制对象的生命周期并限制其可访问性时，单例可以派上用场。