"Observability is the degree to which the results of an innovation are visible to others." If the live demos, prevalent advertising, and magazine write-ups didn't convince you, 1-2-3 made it clear in the product name itself that you're getting 3x what VisiCalc delivers. Check.
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，详情可参考新收录的资料
header[11], header[12], header[13])。新收录的资料对此有专业解读
Photograph: Brad Bourque
# Represents a positive number in a closure