He is using binoculars to observe birds.

He was hospitalized due to pleurisy.

He read the small print using a magnifying glass.

We must strive to protect the natural environment.

Even after a day passed, there was no reply from him.

In Japan, compulsory education lasts for 9 years, from age 6 to 15.

He was observing birds using his new binoculars.

Phonons are an important concept in solid state physics.

My friend came from the Slovak Republic.

I want to go to the Republic of Serbia.