短语讲解：

1. VOA reporters in the area saw a number of Ukrainian soldiers arriving at the train station in the eastern city of Kramatorsk.

a number of 一些; 许多的
例句：A number of regulators launched investigations.
许多监管人员对此展开了各类调查。
arrive at 到达; 来到
例句：I arrive at my hotel late in the evening.
傍晚时分，我到达了预定的酒店。

2. The 87-year-old former leader has been in prison since his arrest in 2011. Mr. Mubarak ruled Egypt for 29 years.

in prison 坐牢
例句：He could face life in prison.
他可能被判终身监禁。