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The swine flu was just a epidemic in Mexico in the first place, but it has been spreading so quick that it is a pandemic bothering half of the world.
Please correct my sentence, if you think it sounds not normal. Thanks a lot.
Thank you Clive for your explanation. I was quite surprised to learn that many of the medical proffessionals couldn't answer my question.
With Regards,
Epi microscope objectives are only used to examine the surface
of an object (as opposed to internal structure biological viewing).
The epicenter of an earthquake is the point on the surface of the
earth that is directly above (i.e. or closest to) the internal faulting
zone.