1N-UNCOUNT [oft with poss]严重惩罚The nemesis of a person or thing is a situation, event, or person which causes them to be seriously harmed, especially as a punishment. 严重惩罚
The new mathematics test will become the nemesis of teachers.
新的数学测试将会是对老师们的严重惩罚。
2N-COUNT 天敌A person's nemesis is their opponent or rival, especially one who has been their opponent or rival for a long time. 天敌
Sun Microsystems gave up its legal fight with Microsoft and agreed to cooperate with its longtime nemesis.