290. It came as something of a surprise when Diana, Princess of Wales, made a trip to Angola in 1997, to support the Red Cross's campaign for a total ban on all anti-personnel landmines.

英语四级译文:
1997年，威尔士王妃戴安娜出访安哥拉，支持红十字会关于全面废除非人道地雷的活动，这一事件在当时引起了轰动。

四级词汇讲解:
when引导的是主语从句，句首的it仅为形式主语。插入语Princess of Wales是Diana的同位语;to support the Red Cross's campaign...landmines为目的状语，其中all anti-personnel landmines为介词on的宾语。

campaign for的意思是“要求(为争取)…的运动”。如:
He conducted a compaign for reform.他领导了一场要求改革的运动。

ban on的意思是“对……的禁令”。如:
There is a total ban on smoking in the office.办公室全面禁止吸烟。

英语四级考点归纳:
有关surprie的短语有:

※ come as a surprise意为“出乎意料”。如:
The news that he was leaving came as a surprise to everyone.他要离开的消息让所有人大感意外。

※ with/in surprise意为“吃惊地”。如:
He noticed with surprise the change in her appearance.他吃惊地注意到了她外表的变化。

※ take sb. by surprise意为“出乎某人意料”。如:
The heavy rain took us all by surprise.这场大雨让我们大家猝不及防。

※ take sb./sth. by surprise意为“出其不意地袭击某人(某物)”。如:
Rebel forces took the city by surprise.叛军出其不意地攻占了该城市。