短语讲解：

1. Officials reportedly are concerned about a possible poisonous chemical spread.

concern about 使（自己）关心…
例句：You need feel no concern about the matter.
你不必担心那件事。

2. A team of more than 200 military nuclear and biochemical specialists has been searching the area for possible dangerous chemicals.

more than 超过; 不只是
例句：Margaret needed support more than ever.
玛格丽特比以往更需要关心。

3. Chinese Central Television reported that rescue operations were suspended Saturday after a new fire broke out.

break out 突然发生，爆发（战争、打斗等不愉快事件）
例句：Armed conflict may break out at any moment.
武装冲突有一触即发之势。

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