1. 特定时刻；（尤指）当口，重要关头
At a particular juncture means at a particular point in time, especially when it is a very important time in a process or series of events.

1. an event that occurs at a critical time

e.g. at such junctures he always had an impulse to leave
it was needed only on special occasions

Synonym: occasion

2. the shape or manner in which things come together and a connection is made

Synonym: articulationjoinjointjunction

3. a crisis situation or point in time when a critical decision must be made

e.g. at that juncture he had no idea what to do
he must be made to realize that the company stands at a critical point

Synonym: critical pointcrossroads