1. A premature contraction of the heart, resulting in momentary cardiac arrhythmia. 
   期外收缩心脏房室的过早心搏，导致短暂的心律不齐
2. Severe treatment or conditions 
   严厉的对待；艰苦的环境
3. Very severe or unpleasant 
   极厉害的；极讨厌的；要命的
4. Got a severe concussion. 
   受了严重的脑震荡
5. I have severe hives. 
   我患有严重的麻疹。

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