Don't be embarrassed by your failures, learn from them and start again.
By used books. They have the same words as the new ones. Also libraries.
The coal industry must unswervingly follow the path of safe, efficient, clean, and low-carbon development.
What can be said at all can be said clearly; and whereof one cannot speak thereof one must be silent.
美国是世界上最强大的国家，在可预见的未来仍将如此。
Psychology must be a purely descriptive science.
Music is the language of the soul, and it has the power to connect us all.