We believe that a reform of the education system is necessary.

The accuracy of this machine is astonishing.

This park is divided into several sections.

Trigonometric functions are one of the basic concepts in mathematics.

He is good at solving problems of trigonometric functions.

He drew a pentagon on the blackboard.

The magnification of this microscope is 100 times.

The range of functions has expanded due to the expansion of this software.

The cell nucleus holds genetic information.

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