roll ·phrase (IDIOM)
Definition: to begin an activity that involves a group of people Level: C2
我已经通过安排一系列会议开了个头。
I've ___started ___the ___ball ___rolling by setting up a series of meetings.
为了让募捐活动启动起来，她以一笔慷慨的个人捐款开了个头。
To get the fundraiser going, she ___set ___the ___ball ___rolling with a generous personal donation.
他那个有见地的问题引发了一场非常富有成效的小组讨论。
His insightful question ___set ___the ___ball ___rolling for a very productive group discussion.