慢速英语:American History: Westward Expansion Brings Explorers, Settlers in Contact with the Plains I

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短语讲解：

1. This week in our series, we look at the history of early American Indians.

look at 看
例句：Just look at this funny picture! 
请看这张有趣的画！ 

2. But our story today will focus on the tribes in what became the central part of the United States.

focus on 致力于；使聚焦于
例句：Just turn up the music on your radio and focus on that. 
只要打开收音机专心听音乐就行。 

3. As they come nearer, the Shoshone group sees that we are not ready for war.

be ready for 为...做好准备
例句：The new house is ready for occupation. 
新屋可以居住了。 

4. Because the horse made hunting easier, more time could be spent on other activities, including art.

spend on 花费
例句：Don't worry how much you spend on the trip. 
别担心花多少钱用于旅行。 

5. America's westward expansion led to violent clashes between white settlers and Native Americans.

lead to 导致
例句：He speculated that this might lead to a success. 
他推测这可能会导致成功。