慢速英语:Cameras Capture Pictures of Mysterious Bush Dog

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短语讲解：

1. They are known to communicate to each other using “high-pitched whines.”

communicate to 传达给…; 向…表达; 传染
例句：They successfully communicate their knowledge to others.
他们成功地把知识传授给他人。
each other 互相，彼此
例句：The new neighbours were getting to know each other.
新邻居之间正在互相了解。

2. The International Union for Conservation of Nature says bush dog populations have dropped by up to 25 percent over the past 12 years.

up to 多达; 直到; 在于…; 能胜任
例句：The bill footed up to $1,000.
账单结算总计1,000元。