Sentence examples for it is challenge from inspiring English sources

It is difficult, it's a challenge, but ultimately it is challenge we have got to face and deal with.

It is challenge work to design parareal algorithms for time-fractional differential equations due to the historical effect of the fractional operator.

It is challenge breaking out of that, especially when you're remembered as being a cute, or awkward, or weird, or chubby kid on screen.

It is challenge to annotate the function of new proteins lacking of structure and sequence similarity with the known proteins for the traditional approaches.

Therefore, it is challenge to differentiate an AML from a renal cell carcinoma (RCC) when the CT examinations show calcifications, especially when fatty components are not identified by imaging.

But it is challenging.

It is "challenged" but not "in crisis".

I don't believe that discussing it is challenging it.

It is challenging!

It is challenging to interact with others.

It was challenging".