Example 1: Duality and contrast are used. The sentence structure is neat and smooth, and the strong contrast between "one small step" and "one big step" highlights that "turning off the lights conveniently" seems trivial, but it is actually a national energy-saving and emission-reduction related plan, which has a strong warning function.

Example 2: Using anthropomorphic technology. The ticking of water reminds you to turn off the tap and save water. It is interesting and easy to accept. (meaning close. )