自然界: nature, the natural world...
只管: solely engrossed in one thing, just (one thing, no need to worry about the rest), simply, by all means, please feel free, do not hesitate (to ask for sth)...
民族: nationality, ethnic group...
界: circles; world (circle of literature and art)...
减压: to reduce pressure, to relax...
胸有成竹: to plan in advance (idiom), a card up one's sleeve, forewarned is forearmed...
急剧: rapid, sudden...
卫星: satellite, moon...
公证: notarization, notarized, acknowledgement...
手掌: palm...
