smallpox vaccination; inoculation against smallpox
rate; ratio; proportion; percentage
to remain; to abide; to stay (in the one place); to be limited to; to be confined to; to only account for
global scale; worldwide scale
infection; contagion; becoming infected
what is called; as it is called; the so-called; so to speak
condition; term; requirement; qualification; prerequisite
question; inquiry; enquiry
strong; potent; strong; brawny; good (at); skilled; being able to handle
component; factor; item (e.g. in list); element (e.g. in array); member (e.g. data structure)
another; one more; not quite; not very good; lacking
to accept (e.g. an explanation); to be satisfied (with); to assent (to)
to go out and away; to leave
to fall fast asleep; to be confined to one's bed; to be laid up
to sever; to cut off; to suppress; to eradicate; to abstain (from); to give up
you've hit the nail on the head; that's just what I thought; that's exactly like I feel; that's exactly what I think, too
cheap; rash; thoughtless; careless
infectious disease; infection
quite; very; 10^48; quindecillion
for; for the sake of; to one's advantage; because of; as a result of
even so; however; still; whereupon; even though; nevertheless
the past; bygone days; one's past (that one would prefer remained secret); past (tense); preterit; previous life
outbreak of an illness; onset of an illness; appearance of symptoms
limits; boundary; domain; area (e.g. in programming languages)
to cause; to induce; to bring about; to pull upright; to help up (e.g. a fallen person)
means of transportation; transport service
at the most; at best; to the utmost; as much as possible; as much as one can
coach (horse-drawn); carriage; wagon; cart
present age; present day; today; modern era; modern times