He is very mature at this age.

他在这个年纪已经很成熟了。

This river and that river cross at this point.

这条河和那条河在这个点相交。

The river is widest at this point.

这条河在这个点是最宽的。

The river is very wide at this point.

这条河在这个地方非常宽。

The store is still open at this hour.

商店在这个时间仍然开着。

At this stage, you need more practice.

在这个阶段，你需要更多的练习。

The river is very broad at this point.

这条河在这个地方非常宽。

He remains in good health at this age.

他在这个年纪依然保持着健康的体魄。

He has worked at this post for ten years.

他在这个岗位上工作了十年。

At this stage, we are focusing on research.

在这个阶段，我们专注于研究。