慢速英语:Growing Violence at Donald Trump Campaign Events

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短语讲解：

1. Republican and Democratic opponents said Trump is responsible for the clashes at these events.

be responsible for 为…负责，形成…的原因; 主管
例句：You'll be responsible for anything wrong.
出了事唯你是问。

2. But in recent days both Rubio and Kasich have said they may not be able to do so if Trump is the nominee.

be able to 能够; 能
例句：When will you be able to deliver?
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