Copy-On-Write是英语中的术语，中文翻译为“写时复制”。这个术语通常用于计算机科学中，是指一种在创建一个副本时，只有在副本需要修改时才会复制原始数据的技术。
例句：
1. If multiple processes try to modify the same memory page, the operating system can use copy-on-write to ensure that each process has its own identical copy of the page.（如果多个进程尝试修改同一个内存页面，则操作系统可以使用写时复制来确保每个进程都有其自己的相同副本。）
2. Copy-on-write is a memory optimization technique that can improve performance by reducing the amount of memory that needs to be copied.（写时复制是一种内存优化技术，可以通过减少需要复制的内存量来提高性能。）
3. When a process forks, the copy-on-write technique can be used to initially share the memory space between the parent and child processes.（当一个进程分叉时，写时复制技术可以用来最初共享父进程和子进程之间的内存空间。）
4. Copy-on-write is not always the best option, as it may result in a performance penalty for certain types of applications.（写时复制并不总是最好的选择，因为它可能会导致某些类型的应用程序性能下降。）
5. The copy-on-write technique allows multiple processes to share the same memory space without having to create separate copies of the data until it is actually modified.（写时复制技术允许多个进程共享同一内存空间，而无需在实际修改数据之前创建单独的副本。）
6. Some modern file systems use copy-on-write to ensure that data integrity is maintained in case of system crashes.（一些现代文件系统使用写时复制来确保在系统崩溃的情况下保持数据完整性。）
7. Copy-on-write can be a useful technique for creating copy-on-modify data structures such as trees or graphs.（写时复制可以是创建一些数据结构如树或者图的修改副本的有用技术。）
8. The copy-on-write technique can be used to create efficient storage mechanisms for virtual machine systems.（写时复制技术可以用于为虚拟机系统创建高效的存储机制。）
9. Copy-on-write is a clever way of optimizing memory usage in systems that need to fork many processes.（写时复制是一种优化内存使用的巧妙方式，适用于需要分叉多个进程的系统。）
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