research institute; (research) laboratory
brothers and sisters; siblings
combination; assortment; matching (in a contest); pairing; combination
distinction; discrimination; discernment; identification
to close one's eyes partly; to squint; to smile with one's whole face; to smile sweetly (at); to look fondly (at)
deep sea; depths of the sea; ocean depths
calmly; quietly; gently; be quiet!
to live up to expectations; to meet expectations
to push; to propel; to shove; to spur (someone); to stimulate; to impel
to worry about; to be anxious about; to be concerned about; to lament; to grieve; to mourn
I see; that's right; indeed
cannot be undone; can't be recovered from
to commit (e.g. crime); to perpetrate; to break (e.g. rule); to violate; to rape; to violate
to cry and shout; to scream
extinction; extinguishment; disappearance; annihilation
century; hundred years; (fig.) a long time
labyrinth; maze; mystery; dungeon
shy; diffident; retiring; reserved
turning over in bed; rolling over; tossing and turning; betrayal; double-crossing
deep sleep; sound sleep; profound sleep
(looking) blankly; vacantly; dazedly; (staring) in puzzlement; with a look of amazement
to speak words (of); to speak (to); to say (something); to say some (kind, comforting, etc.) words
somersault; looping-the-loop
department (of a university or hospital); course (of study); branch of study; family
pose; pose; posturing; pause; rest
now that you say that; now that you mention it
bipedal walking; walking on two legs
hair; fur; wool; down; plumage
to give an order; to place an order; to have made to order
goggling; rolling (one's eyes)
to get slightly dirty (all over)
furnishings; implements; equipment
in addition; furthermore; above (which); on top of (which)