比如，一个activity要把图片上传至Web网站，就应该创建一个服务来执行之，即使用户离开了此activity，上传还是会在后台继续运行。

For example, an activity that's uploading a picture to a web site should start a service to perform the upload so that the upload can continue in the background even if the user leaves the activity.

youdao

继续上传图片，大家姑且看之。

Continue to upload pictures, you see a mention.

youdao