The Po Valley is a large plain in northern Italy.

The decline of the economy is affecting the entire country.

His eyesight is declining year by year.

It is very interesting to explore the origin of this tradition.

Do you remember the formula to calculate the cosine, which is one of the trigonometric functions?

This problem can be solved using the cosine function.

Daigen is another notation for Daigen.

He is quite a good cook.

I think his Japanese has improved quite a bit, hasn't it?

I am busy with work during the daytime.