BBC在线收听下载:巴拉圭抗议者突袭国会

1.prevent vt.预防; 阻止; 阻碍
例句：These methods prevent pregnancy
这些方法能防止怀孕。

2.announce vt.宣布; 述说; 声称
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。

3.detention n.拘留，扣押; 阻留;
例句：They have been held in detention since the end of June
他们从6月底以来就一直受到监禁。

4.convert vt.（使） 转变; 使皈依
例句：The signal will be converted into digital code.
信号会被转变为数字代码。

5.arrest vt.逮捕，拘捕; 止住，阻止
例句：The sufferer may have to make major changes in his or her life to arrest the disease
患者可能必须对生活习惯作出重大调整以控制病情。