挑战是伪装的机会，勇敢地拥抱它们。
The choices women make in their careers are often constrained by societal expectations and institutional barriers.
The true joy of mathematics lies in the act of discovery, not just the result.
采矿业必须在安全、可持续性和社会责任方面以身作则。
Perhaps as important is the relation between the existence of solutions to a competitive equilibrium and the problems of normative or welfare economics.