{{Grammar Box}} You probably already know how to [[Expressing location with "zai⋯⋯shang/xia/li"|express location with "在"]]. In this article, we'll go more in depth as to how you can make idiomatic phrases using that construction. This kind of form is actually similar to some that we have in English, so it won't be too difficult. ===Expressing "on the topic of" with "在⋯⋯上"=== This construction can be translated as "on the topic of" or "in regards to." It can be used to comment on an idea or concept. The examples below will help.