ex·ter·nal·i·ty /ˌɛkˌstɚ/
外形,外在性
Ex·ter·nal·i·ty n. State of being external; exteriority; Metaph. separation from the perceiving mind.
Pressure or resistance necessarily supposes externality in the thing which presses or resists. --A. Smith.
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externality
n : the quality or state of being outside or directed toward or
relating to the outside or exterior; "the outwardness of
the world" [syn: outwardness] [ant: inwardness]