A moment is a small piece of time, but it can be a very important piece of time.
片刻是时间的一小部分，但它可能是非常重要的一部分。
总统的职位是伟大的，但担任这个职位的人并不伟大。
Sustainability in mining is not an option—it's a necessity for our future.
We are what we pretend to be, so we must be careful about what we pretend to be.