短语讲解：

1. In recent years, the king suffered from a series of age-related health problems that mostly kept him in a Bangkok hospital.

suffer from 患（某种病），受（某种病痛）折磨
例句：I often suffer from unaccountable headaches.
我常莫名其妙地头疼。

2. Supporters believe King Bhumibol provided unity and stability at a time when Thailand faced many social and economic problems.

at a time 依次， 逐一， 每次
例句：Can I borrow two books at a time?
我可以一次借两本书吗？


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