BBC在线收听下载:叙利亚政府与反对派达成停火协议

短语讲解：

1. President Obama has ordered the expulsion of 35 Russian diplomats in response to Moscow's alleged interference in the US presidential elections through hacking operations.

in response to 对…做出反应
例句：The meeting was called in response to a request from Venezuela.
应委内瑞拉的要求召开了这次会议。

2. A nationwide ceasefire agreed by the Syrian government and rebel factions has come into force.

come into force 开始生效
例句：The first price increases are due to come into force in July
第一批提价预计将在7月开始执行。

3. A number of organisations are not covered by the truce including Islamic State.

a nmuber of 一些; 许多的;
例句：Two significant constants have been found in a number of research studies.
若干研究已经发现了两个重要常量。