The point in orbit farthest from the Earth.
The animal constituent of plankton.
Injury to the middle ear caused by a rapid change in pressure. May result when ears aren't cleared on a descent.
any chemical agent used chiefly on inanimate objects to destroy or inhibit the growth of harmful organisms.
a hormone secreted by the pineal gland in inverse proportion to the amount of light received by the retina, important in the regulation of biorhythms: in amphibians, it causes a ...
The cutting off of light from one celestial body by another.
Constant is a name for a value that, unlike a variable, cannot be reassociated with a different value
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system of interconnected computer equipment that permits the sharing for information
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南斯拉夫
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