Usages of néngyuán
为了 节省 能源， 学校 晚上 十 点 以后 关 掉 很多 灯。wèile jiéshěng néngyuán, xuéxiào wǎnshang shí diǎn yǐhòu guān diào hěnduō dēng.
To save energy, the school turns off many lights after ten o’clock at night.
多 走路 少 开车 不但 能 节省 能源， 还 可以 减少 污染。duō zǒulù shǎo kāichē búdàn néng jiéshěng néngyuán, hái kěyǐ jiǎnshǎo wūrǎn.
Walking more and driving less not only saves energy, but can also reduce pollution.
Elon.io is an online learning platform
We have an entire course teaching Chinese grammar and vocabulary.