He is majoring in exegesis.

He swallowed his saliva with a gulp, perhaps because he was nervous.

Wu was an ancient country in China.

If there are many complaints, the business will not go well.

This cake is filled with plenty of strawberry cream.

We should always remember the power of Kannon in difficult times.

A positive-definite matrix is an important concept in linear algebra.

A positive-semidefinite matrix is one of the important concepts in linear algebra.

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

A skew-symmetric matrix has the characteristic that its transpose matrix is the inverse of the original matrix.