one by one; one each; one at a time
to insert; to put in (such that there is a snug fit); to have sex; to fuck; to pigeonhole (into a particular category); to place a ring-shaped object around something (esp. one that restricts freedom, such as handcuffs)
with all one's strength; with might and main; as hard as one can
to help; to assist; to aid; to contribute to; to be a factor in
two persons; two people; pair; couple
taking a quantity (of time, people, etc.); similar to ...; dependent on ...; reliant on ...; while ...; when ...
to cure; to heal; to fix; to correct; to do over again; to replace
to turn; to revolve; to visit several places; to function well; to pass a certain time
ago; since; before; previous
whirling; revolving; coiling around; winding around; working tirelessly; working hard
Lagrangian point; Lagrange point
device; instrument; vessel; container; ability; capacity
few decades; many decades; several decades
hermetically seal; sealing (e.g. envelope)
atmosphere; air; magnanimity; generosity
numerator; molecule; member; element
structure; construction; makeup; framework; organization; pattern
crevice; crack; spare moment; interval; chink (in one's armor, armour); unpreparedness
cutting pliers; lineman's pliers; combination pliers
bothersome; tiresome; bother to do
to dismantle; to demount; to take something away; to detach
natural extinction; dying a natural death; coming to a natural end
to mind (negative nuance); to care about; to worry; to pay undue (amount of) attention to (something)
practice; training; drill; (an) exercise; workout
sailing ship; sailing boat; sailing vessel
to approach; to draw near; to get close; to get acquainted with; to get closer to; to get to know
to peek (through a keyhole, gap, etc.); to look down into (a ravine, etc.); to peek into (a shop, bookstore, etc.); to sneak a look at; to take a quick look at; to peep (through a telescope, microscope, etc.); to stick out (a scarf from a collar, etc.)
to chase; to run after; to pursue
guidance; leading; induction; introduction; incitement; inducement
or rather (say); or better (say); or perhaps I should say; or, how should I put it; I mean
macromolecule; high polymer
to thrust (something) into (something); to cram; to plunge into; to charge into; to delve into (a matter); to go into depth; to press (someone) about
fingertip; finger; toe tip; toe
to pinch; to hold (between one's fingers); to pick up and eat; to snack on; to pick out (the main point); to summarize