【讲解】：有志之士和仁人，不会贪生怕死而损害仁，只会勇于牺牲来成全仁。

As in geometry the most natural way of beginning is from a mathematical point, so is the same method in observations and natural history the most genuine, simple, and instructive.

Identity is a fragile thing, easily lost and hard to regain.

智能化矿山建设是煤炭行业未来发展的方向。