Learn Chinese Smarter
zhè ge xì tǒng bù dàn qiè hé shí jì cóng shēng tài xué guān diǎn lái kàn yě shì hé lǐ de
这个系统不但切合实际,从生态学观点来看也是合理的。
The system is both practical and ecologically sound.
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