The only limit is the one you set yourself.

要说“我爱你”，首先必须知道如何说“我”。

The quarry industry must evolve with technology, or risk being left behind.

I'm interested in the weak materials, the materials that people don't think can be used for permanent structures.

能源的未来不是要在化石燃料和可再生能源之间做出选择，而是找到确保可靠性、可负担性和可持续性的正确平衡。