她突然感到胸口剧痛，立即被送往急诊室。

She suddenly felt severe chest pain and was taken to the ___ER immediately.

这枚硬币上刻有E.R.的标记，代表伊丽莎白女王。

The coin bears the mark ___E.R., standing for Elizabeth Regina.

这种降压药是缓释型的，每天只需服用一次。

This blood pressure medication is ___extended-release, so you only need to take it once a day.