He is composing a poem.

In this chemical experiment, we will examine the properties of benzoic acid.

In Christianity, the Last Supper is considered a very important event.

The aunt was playing with the children in the park.

The uncle was reading a newspaper in the park.

I have been to Santo Domingo.

We spread phosphate fertiliser on the field.

In this chemical reaction, cyclohexane is the main product.

In linear algebra, triangular matrices play a very important role.

A lower triangular matrix is a matrix where all the elements below the main diagonal are zero.