Please refrain from going out because community-acquired infections are spreading rapidly.

He is in the midst of studying for the exam.

He has completed the entry and exit procedures.

We introduced a new milking machine to the farm.

He has a self-centered personality and doesn't listen to others' opinions at all.

He is majoring in aerospace engineering.

His misdeeds should receive divine punishment.

An antiprism is a part of geometry, and its shape is very unique.

He made a model of a triangular prism.

The airplane disintegrated in mid-air.