自动门
zìdòng mén
Automatic door
这台机器是自动的。
Zhè tái jīqì shì zìdòng de.
This machine is automatic.
他自动帮忙。
Tā zìdòng bāngmáng.
He helped on his own.
学生自动交作业。
Xuésheng zìdòng jiāo zuòyè.
The student turned in the homework voluntarily.
