节约就是生产：

Saving is to produce.

少开一盏灯，奉献一片情：

less open a lamp, giving a feeling.

奢侈是民族衰弱的起点：

Luxury is the beginning of national decline.

节约用水，每一滴都至关重要：

Save water, every drop counts.

人走灯灭，节约用电：

Saving electricity, people go out of the lamp.

这些句子简洁明了地表达了节约资源的重要性，适合用于各种宣传材料或日常提醒。