Atsushi is good at chess.

Etsuko went to pick up the child.

His thoughts always guide his actions.

The ape is my favorite animal.

Please add a little vinegar to this salad.

We cannot live without oxygen.

An isotope refers to elements with the same atomic number but different numbers of neutrons.

Rare earth elements are essential materials for the manufacture of electronic devices.

Hydrogen is the most abundant element in the universe.

Transition elements play an important role in chemical reactions.