为了节约电，晚上睡觉前记得关灯。

Wèile jiéyuē diàn, wǎnshang shuìjiào qián jìde guān dēng.

To save electricity, remember to turn off the lights before going to sleep at night.

请大家节约用水，不要洗澡洗太久。

Qǐng dàjiā jiéyuē yòngshuǐ, búyào xǐzǎo xǐ tài jiǔ.

Everybody please conserve water, don't take long showers.

节约时间可以让工作更有效率。

Jiéyuē shíjiān kěyǐ ràng gōngzuò gèng yǒu xiàolǜ.

Saving time can make work more efficient.