this juncture meaning in English

在这个当口

At this juncture nicholas took his leave .
尼古拉就在这当儿和大家告辞。
Sowerberry returned at this juncture .
正在这个节骨眼上，索厄伯里回来了。
At this juncture his office door opened .
正在这个关头，他的办公室的门开了。
It is precisely at this juncture that the boss finds himself in double jeopardy .
恰恰在这个关键时刻，上司发现自己处于进退两难的境地。
Would it be out of line if i asked at this juncture . .
在这个节骨眼上若我问

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