It is reported that North Korea has conducted another underground nuclear test.

He is an expert in experimental psychology.

He is spending a lot of time on experimental research.

A comprehensive reform is necessary to eradicate the root of the problem.

He tried to solve the problem radically.

Please find the cube root of this number.

He didn't move, like a stump.

He fractured his tarsal bone.

He fractured his carpal bone.

She does exercises to strengthen her procerus muscle every day.