○○○ strain ⪢⪢
People feared starvation and disease and the relations between villagers were _____ed. To make matters worse, 1692 brought one of the coldest winters on record.
http://qindex.info/i.php?x=14050

○○○ light ⪢⪢
It is made when matter is heated up or gains energy.
http://qindex.info/i.php?x=16150

○○○ fluctuate ⪢⪢
Productivity matters mostly in the long run but credit matters mostly in the short run. This is because productivity growth doesn't fluctuate much. So it's not a big driver of economic swings. #economy
http://qindex.info/i.php?x=19905

○○○ elaborate ⪢⪢
When stars with masses a bit bigger than our own sun reach the end of their life and begin to collapse to form light hot dwarf stars, they will throw off their outer layers of matter. This matter will spread and form an elaborate cloud of gas which ...
http://qindex.info/i.php?x=19940

○○○ Potoo ⪢⪢
The Potoo bird is, without doubt, one of the strangest and most unique birds in the animal kingdom, that is, if you can spot them, their feathers in general physique for that matter are incredibly well suited to camouflage themselves in the wild.
http://qindex.info/i.php?x=26409

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