Subject + 自动 + Verb
自动 (zìdòng) is an adjective or adverb meaning "automatic" or "automatically." It describes actions that happen on their own without external control or deliberate effort, and is used for both mechanical automation and natural reflexive actions.
门是自动关上的,不用你去推。
Mén shì zìdòng guānshàng de, bùyòng nǐ qù tuī.
The door closes automatically; you don't need to push it.
手机每天晚上会自动更新软件。
Shǒujī měitiān wǎnshàng huì zìdòng gēngxīn ruǎnjiàn.
The phone automatically updates its software every night.
灯坏了,它一直在自动闪烁。
Dēng huài le, tā yìzhí zài zìdòng shǎnshuò.
The light is broken; it keeps flickering automatically.