然 - sort of thing, so, if so

natural science

natural; right; proper; just; reasonable; appropriate; deserved

nature

open; public; official; overt

inevitable; necessary; certain; sure

inevitable; necessary

just like; (virtually) no different from; (almost) the same as; as good as (e.g. dead, settled)

abrupt; sudden; unexpected

nature; the natural world; realm of nature

coincidence; chance; accident; fortuity

before it happens; previously

(not) at all; (not) in the slightest