VOA慢速英语:Second Texas Nurse with Ebola Flew on Plane on Monday

词汇讲解：

1. commercial adj.商业的; 贸易的
例句：There has been much gossip in commercial circles as to his resignation.
关于他的辞职，在商界一直有很多流言蜚语。 

2. positive adj.积极的; 确实的
例句：He has a positive attitude towards life. 
他对生活持有积极的态度。 

3. announce vt.宣布; 述说
例句：Please announce to the children that there will be no school this afternoon. 
请通知孩子们今天下午不上课。 

4. arrest vt.逮捕，拘捕
例句：Attempts are being made to arrest the spread of the disease. 
现正设法遏止这种疾病的蔓延. 

5. victim n.牺牲者，受害者
例句：He is the victim of a masked holdup. 
他是一次蒙面抢劫的受害者。  
 
6. surveillance n.盯梢，监督
例句：The police kept the criminal under strict surveillance. 
警察严密监视那个罪犯。