I am good at the science subjects which are challengeable.
我的理科学得很好，我觉得这些科目比较具有挑战性。
Secondly, being a college teacher is challengeable for me.
其次，做一名大学老师也是一项很具有挑战性的工作。
Power System Voltage Stability is a challengeable problem .
电力系统电压稳定性是一个具有挑战性的问题。
I want to do some challengeable work to show my personal value.
我想做一些比较具有挑战性的工作来体现我的个人价值。