VOA慢速英语:Study Finds 182 Tigers Left in World's Biggest Natural Habitat

短语讲解：

1. A new study shows that the animals are far more at risk of extinction than wildlife experts believed.

at risk 有危险
例句：He saved three children alive at risk of his life.
他拼命救出了三个孩子。

2. The finding was based on the study of tiger paw prints, also called “pug marks.”

base on 使建立在…基础上
例句："Base on Yunfu, orient to the world and aim at the future."
立足云浮,面向世界,走向未来。

3. The latest census used infrared cameras to arrive at what wildlife experts believe is a more exact number.

arrive at 到达; 来到
例句：I calculated that we would arrive at 6.00 p.m.
我估计,我们下午6时会到达。

4. He said, “Many areas of the vast Sundarbans remain uNPRotected due to insufficient patrol posts and forest guards of the forest department, giving the criminals the opportunity to poach the lucrative tiger.”

due to 由于; 因为; 欠下债[账]，应给予
例句：Success was due to his inhuman efforts.
成功归功于他超人的努力。