短语讲解：
1. President Barack Obama says Iran's government must be held accountable for what he calls "dangerous and reckless behavior" in what the U.S. has alleged was a plot to assassinate Saudi Arabia's ambassador to the United States.
accountable for对……负责
例句：You will be held accountable for it.
你应对此做出解释。
2. Mr. Obama called it a "dangerous escalation" and part of a pattern of dangerous and reckless behavior, adding Iran must pay a price in terms of further isolation.
in terms of就…而言, 从…方面说来
例句：He thought of everything in terms o
