A/B testing 其实就是控制变量法，对比实验。一般谈论的应用是网上线上发布的应用、网页等等 需要做分流，将整体分为用户样本集合A和用户样...

Gcloud in Mac We need to follow the guide and download the SDK from this...

Download the dvd iso files. Make a directory for mounting the iso files ...