VOA慢速英语:Buchanan Considered One of the Worst US Presidents

短语讲解：

1. But he had lived in some areas where slavery was banned.  So he claimed he was a free man.

live in 住在学习[工作]的地方; 住在（某地）; 存在于…; 为…而生存
例句：I live in the south carolina.
我住在卡罗来纳州南部。

2. Ms. Baker says Buchanan also violated the U.S. Constitution by intervening in the case.

in the case 在这种情况下
例句：In the case of cotton processing, opening is necessary preliminary to cleaning. 
在纺棉的情况下，开棉是除杂前必须的。 

3. In the end, Buchanan divided his party and failed to win support for slavery in Kansas.

fail to 未能…
例句：Fail to pay and they'll cut off the electricity. 
你（如果）不付款，他们就要断电。 

4. In Buchanan’s final weeks in office, several southern states separated from the Union. 

separate from 分开; 区别
例句：That unit is separate from central huijin.
该子公司独立于中央汇金。