polygyny

one wife and multiple husbands, polyandry

Polygamy

more than a year

more than one hundred and fifty years [written and colloquial]

group sex with one man and many women [written and colloquial]

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describes the situation where if someone has tried his / her luck for many times (normally in doing unpleasant things), then one day, he / she most probably will get caught or encounter a negative outcome; literally 'if you go up the mountain often you'll eventually encounter a tiger'

Rare

just right

incomparable

so many

many years later

Twenty-something

Many hands make the job easy

too many cooks in the kitchen, too many people trying to work on the same task / project and that messes up the progress

even more

commit all sorts of crimes and wickedness

to describe doing something sneakily, so that nobody realizes it

mostly

more likely to be bad than good

Jiaduobao

Ecuador

(adjective) loquacious; talkative; garrulous; long-tongued

one who speaks with no respect for anyone will attract a troublesome life

(proverb) to describe someone who is talkative; loquacious; garrulous; a big mouthed person; a loquacious person

approximately

so much

so many people

why don't you die when there's so much death?