He warned the young people, saying 'At thirty, one should not be careless, at forty, one should not be indecisive.'

He was dragging the heavy luggage.

Please tell me the International Standard Book Number of this book.

He started a business without a plan, forgetting the lesson of 'peach and chestnut seeds take three years to bear fruit, persimmons eight years.'

He faced difficulties with the spirit of 'one eye, two feet, three gallbladders, four strengths'.

This is my first trip to Japan.

This ancient document uses the character '疏'.

This is a model of a mutetrahedron.

This mutetrahedron has a very unusual shape.