The diagonal elements of this matrix are all 1.

The signal from the cell phone relay-station in this area is weak.

I create a balance sheet every month to understand my financial situation.

The Taiwan Strait is the strait that separates China and Taiwan.

He decided to challenge the exploration of the Dark Continent.

He always boasts, but in reality, he does nothing.

He has a habit of always boasting.

The launch of intercontinental ballistic missiles has become an international issue.

He is preparing to explore the Dark Continent.

I studied Classical Chinese in university.