无人机技术最大的价值在于它能到达人难以到达的地方。

Sustainability isn't a trend; it's a responsibility.

真正的竞争对手从来不是同行，而是用户的旧习惯。

数学的本质在于它的自由。

The world is not a mere sum of sensations, but an organized whole.

You are too generous to trifle with me. If your feelings are still what they were last April, tell me so at once. My affections and wishes are unchanged, but one word from you will silence me on this subject for ever.