我们地球的过去历史必须通过现在可以看到的现象来解释。

利润和可持续性必须齐头并进，缺一不可。

The typewriting machine, when played with expression, is not more annoying than the piano when played by a sister or near relations.

当我们停止指责并开始解决问题时，进步就会发生。