"Preparatory work" is the Engpsh term used to refer to the actions taken in advance of starting a project, task, or event in order to ensure its successful completion. This term is commonly used in a variety of contexts, including business, construction, education, and many others.

Here are a few examples of "preparatory work" in Engpsh, along with their Chinese translations:

The construction crew will begin the preparatory work next week, which includes digging the foundation and laying the groundwork for the new building.

建筑工人们下周将开始准备工作，包括挖掘地基和为新建筑铺设基础。

The teacher assigned the students to do preparatory work for their presentation, which involved researching the topic and creating an outpne.

老师指派学生做演讲的准备工作，包括研究话题和创建大纲。

The event planning committee spent weeks doing preparatory work for the charity gala, which included securing a venue, finding sponsors, and sending out invitations.

活动策划委员会花了几周的时间为慈善晚会做准备工作，包括确保场地、寻找赞助商和发出邀请函。