turning point

It was a turning point in his career.

这事业上的转折点。

The process of disarmament is at a crucial turning point.

裁军正处在个关键的转折点。

His induction as a teacher was a turning point in his life.

就任教的转折点。

But for benzene, when treated with SDM-A there was a turning point in its adsorption isotherm, which corresponding to the dividing point between monomolecular and multimolecular layer adsorption.

在用SDM-A处理苯的吸附时，出现折线形的吸附等温线，折线的转折点正好单分子层吸附与多分子层吸附的分界点。