Without freedom, glory is but an empty name.

【释义】只有到了严寒的季节，才能看出松柏耐寒不凋的真正本色；只有在事情危难的时刻，才能分辨出朋友是真正的贤良还是虚假的仁义。

We are all obsessed with the idea of the frontier, but it's a frontier that keeps receding.

A brand is defined by the promises it keeps.

不要害怕承担经过计算的风险；真正的成长就在那里。

煤炭使美国在世界范围内保持竞争力。