1.起燃点（化学名词）；2.危险地区（名词）

1. (noun, CHEMISTRY) The temperature at which vapor from a liquid will ignite. (NOTE: also“flash point”)

2. (noun) A dangerous situation, topic, or place where violence may erupt.

1.EXAMPLE: Brandy has a flashpoint of only 27 degrees centigrade, so in cooking, its vapors will easily burn when ignited by a chef.

白兰地的起燃点只有27摄氏度，厨师在烹饪时很容易点燃其蒸气。

2.EXAMPLE: There are a number of flashpoints along the border between the two unfriendly nations where many unpleasant incidents have occurred.

在这两个不友好国家之间的边界有很多危险地区，可能发生很多不愉快的事件。

catch a tiger by the tail

骑虎难下，棘手的局面（成语）

(IDIOM) A situation or condition that is too dangerous to handle safely, and can lead to disaster.

EXAMPLE: My impulsive brother wants to invest all his money in a foreign stock market he knows nothing about, but doing that can be like catching a tiger by the tail.

我的冲动的兄弟想把所有的钱都投入到一个国外的股市，但这么干可能让他骑虎

难下。