广播电视英语短句 第 299 课：关于中风-5

The warning signs usually appear suddenly. 通常会突然出现一些警示征象。

These include trouble walking, weakness especially on one side of the body, difficulty seeing and difficulty speaking. 这些包括行走困难，一侧肢体的无力，看和说话困难。

Yet people who seem healthy can suffer a stroke without even knowing it. 然而，看似健康的人也可能在甚至不知道的情况下患上中风。

A study published in Stroke last year involved about two thousand people with an average age of sixty-two. 发表在去年《中风》上一项约 2000 人与参与的研究，他们的平均年龄在 62 岁。