油然而生

Oil, fat, grease, or petroleum; to paint or varnish; oily or greasy; also slang for cunning or glib; extra profit; to get dirty with oil.

correct; right; so; thus; like this; -ly; yes; certainly; pledge; promise; burn; agree

A conjunction connecting clauses or phrases; indicates addition, contrast, or a causal relationship; also used to indicate a change of state.

To grow, give birth, produce, or be born; to live or be alive; life; raw or uncooked; to arise or occur; student; a person's livelihood.