.  It's the app that has a blue and white icon with a smiley face.  It's located in the dock. It's in the box to the left. It may say Microsoft Office 365, or Microsoft Office 2016, or whichever version of Microsoft Office you have installed. If you are using a magic mouse or trackpad, you can perform a right-click by clicking with two fingers. This will uninstall Microsoft Office.  You can then empty the trash to free up hard drive space.

TL;DR in Chinese:
点击搜索。 点击应用程序。 右击Office软件。 点击移到垃圾箱。