The trouble with recommendation engines is that they're really hard to build.
不过说实话，构建推荐引擎真的是非常困难的一件事情。
Recommendation engines are a response to the strange new world of online retail.
推荐引擎是对网上零售的陌生新世界的一种响应。
Recommendation engines are a response to the strange new world of online retail.
推荐引擎是对网上零售的陌生新世界的一种响应。
应用推荐