challengeable

形容词 challengeable:

1. capable of being challenged

1. The time was ripe for a challenge to the power of the government.
   时机已经成熟，可以向政府权力提出挑战了。
2. They had challenged and beaten the best team in the world.
   他们曾向世界上最强的球队挑战并将他们打败。
3. This career offers a challenge.
   这份职业具有挑战性。
4. Nowadays no one will challenge the fact that the earth is round.
   现在没有人会对地球是圆的这一事实提出异议。