BBC在线收听下载:中国港口城市天津发生大爆炸

短语讲解：

1. State media say 13 people have been killed and hundreds of others injured.

hundreds of 好几百，许许多多
例句：Money to the extent of hundreds of thousands was set in motion.
流通的金钱达几十万金元之多。

2. It shows a bright burning glow on the horizon at a distance of around 2km, possibly more, and clearly something large is on fire, then suddenly another bright flashes a huge fireball, lights up the sky.

light up 照亮; 点烟
例句：It' s time to light up.
该点灯了。

3. Mr. Ban said the Senegalese diplomat Babacar Gaye would step down as head of mission.

step down 退休，辞职
例句：I'm not ready to step down yet.
我还不准备辞职。

4. Correspondents say that factions within the ruling union solidarity and development party have been engaged in a power struggle in recent months.

be engaged in 从事于
例句：He is engaged in scientific pursuit.
他从事科学研究。

5. According to the UN, the parties have committed themselves to reaching a peace agreement within weeks.

according to 根据
例句：Answer a fool according to his folly.
按愚人的蠢话回答愚人。