BBC在线收听下载:中国人民币连续三天贬值

短语讲解：

1. Smoke is billowing from the site of huge explosions in the Chinese port city of Tianjin, which killed at least 17 people and injured hundreds more.

at least 至少
例句：For that day at least he lost heart.
至少这一天他是垂头丧气的。

2. And some of the people here we've spoken to say there were a number of very serious injuries, just as you'd expect.

a number of 一些; 许多的
例句：Monkeys are transmitters of a number of dangerous diseases.
猴子是许多危险疾病的传染媒介。

3. But correspondents say that factions within the ruling party have been engaged in a power struggle in recent months.

engage in 经营; 参加，从事
例句：They engage in the study of music.
他们从事音乐研究。