An entity of non-definite nature that is generic in meaning can also serve as the subject.
Bō cài hěn yǒu yíng yǎng 。
Spinach is nutritious.
(菠菜 is generic.)
Xióng māo zhēn kě ài 。
Pandas are really cute.
(熊猫 is generic.)
 Yip, P. C., Rimmington, D., Xiaoming, Z., & Henson, R. (2009). Basic Chinese: a grammar and workbook. Taylor & Francis.
 Teng, W. H. (2016). Yufa! A practical guide to Mandarin Chinese grammar. Taylor & Francis.