In order to calculate the centroid of this shape, you need to know the area of each part and the position of its centroid.

I'm excited to hear that a new project is starting.

He always has a high sense of alertness.

He has a strong ambition and is always seeking self-improvement.

He is the type of person who thinks it's a moonlit night if it's bright, so he only has a one-sided perspective.

He thought deeply and said, 'I think, therefore I am.'

Strong interaction is one of the four fundamental forces in particle physics.

I am interested in the culture of China.

He is good at reading Chinese text.

I am busy with work during the day.