Freedom of speech is a fundamental element of democracy.

Observing the growth process of a megalopa is very interesting.

He came home covered with mud.

He came home wearing muddy clothes.

Zoroaster was an ancient Persian religious leader, considered to be the founder of Zoroastrianism.

My favorite dessert is a Swiss roll.

In organic chemistry, cyclobutane has a structure in which four carbon atoms are bonded in a ring.

Cyclopropane is a compound often used in organic chemistry.

Cycloalkene is a compound often used in organic chemistry.

Cycloheptane is a compound often used in organic chemistry.