煤炭的未来在于清洁高效利用。
The future of coal lies in clean and efficient utilization.
Did you grow me as food, and that’s why I have no memory?
成为人类就是有缺陷,而有缺陷才是真实的。
数学的研究就像空气或重力——它无处不在,即使你看不到它。