Let's enter upon the question.

我们开始讨论这个问题吧。

I'll enter upon my new duties tomorrow.

我明天将就任新职。

You are about to enter upon a new phase in your life.

你马上就要进入生活的新阶段了。

The countries are about to enter upon their first trade agreement as a unit.

这些国家正准备作为一个小组开始讨论它们之间的第一个贸易协定。

The job was assured, though when the call would come to enter upon his duties nobody knew.

工作是有把握了，尽管什么时候能通知他上班还没有人知道。