Make sure that third-party apps are allowed on your device: go to Menu->Settings->Security-> and check "Unknown Sources"
Tap the APK file. Allow the app any required permissions it asks for. Then, at the bottom of the installer window, click INSTALL.
You'll see a confirmation the app is installed. Now you'll see the app available in your list of installed apps.
《Google Play服务》用于更新Google应用和Google Play提供的其他应用。此组件可提供多种核心功能,例如对您的Google服务进行身份验证、同步联系人信息、提供最新的用户隐私设置,以及低电耗的高品质位置信息服务。此外,Google Play服务还可以提升您的应用体验,包括加快离线搜索速度、提供更贴近实景的地图,以及改善游戏体验。如果您卸载Google Play服务,这些应用可能就无法运行。