Postfix notation is one method of expressing calculations.

This input device is very easy to use.

She was diagnosed with placenta previa.

The issue of the previa vessel is a very important issue in obstetrics.

We plan to hold the meeting in Western European Time.

We will start the meeting at 3 p.m. Central European Time.

I will start the meeting at 9 a.m. Eastern European Time.

This system enables real-time operation.

The time complexity of this algorithm is O(n).