在Ansible中，可以使用"特定操作系统的预任务"来实现"os specific pre_task"的翻译。以下是一个包含代码示例的解决方法：

---
- name: Example playbook
  hosts: all
  gather_facts: yes

  pre_tasks:
    - name: Perform pre-task on Linux
      block:
        - name: Install required packages
          apt:
            name: "{{ item }}"
            state: present
          with_items:
            - package1
            - package2
          when: ansible_facts['ansible_os_family'] == "Debian"

        - name: Enable required services
          service:
            name: "{{ item }}"
            state: started
            enabled: yes
          with_items:
            - service1
            - service2
          when: ansible_facts['ansible_os_family'] == "Debian"

    - name: Perform pre-task on Windows
      block:
        - name: Install required packages
          win_package:
            name: "{{ item }}"
            state: present
          with_items:
            - package1
            - package2
          when: ansible_facts['ansible_os_family'] == "Windows"

        - name: Enable required services
          win_service:
            name: "{{ item }}"
            start_mode: auto
            state: started
          with_items:
            - service1
            - service2
          when: ansible_facts['ansible_os_family'] == "Windows"

  tasks:
    - name: Main task
      # ... rest of the playbook

在上述示例中，使用了两个“特定操作系统的预任务”，分别针对Linux和Windows操作系统。根据ansible_facts['ansible_os_family']的值来执行适当的任务。在Linux上安装和启用相关软件和服务，而在Windows上则使用对应的Win模块来完成相同的任务。