The name "zipper" refers to moving up and down the tree like a zipper, with the part above the focal node as the openpart of the zipper and the local state as the closed part.
It was a bold move on their part to open a business in France.
在法国开业是他们的一个大胆行动。
《牛津词典》
3
As part of a public project that's open to the ideas and hard work of anyone willing to contribute, the incubator offers a chance to test drive new ideas.