BBC在线收听下载:美国石油大亨洛克菲勒去世

短语讲解：

1. Amnesty and other rights groups have called for his immediate release and expressed concern that he might be at the risk of being tortured.

call for 要求; 需要; 去接（某人）
例句：Different circumstances call for different tactics.
不同的情势需要不同的策略。
at the risk of 冒可能…的危险
例句：He saved my life at the risk of losing his own.
他冒着生命危险救了我的性命。

2. They say they will help to locate the climbers if they are in trouble and prevent them from making false claims of reaching the summit.

in trouble 处于不幸中，在监禁中
例句：It's too bad of you to desert her in trouble.
你在她困难的时候抛弃她，真是太差劲了。
prevent from 阻止， 防止
例句：Active cure of swoon patients was important to prevent from complications.
积极救治晕厥患者，对预防并发症有重要意义。