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。

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。

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。

This is the most challengeable response to the secular tide.

这是面对世俗大潮的最具挑战性的回应。

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。