自然
zìrán
I n.
1) natural world
自然的力量很伟大。 The power of nature is immense.
2) subject/course of study concerning natural sciences (in primary school)
3) natural sciences
II s.v.
natural; normal; ordinary; spontaneous; in the course of events
III adv.
of course; naturally
这事情自然是该你做。 Of course, you are supposed to do this.