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自然对数的底
bridg.constr.	base of natural logarithm
dril.	e
el.	the base of natural logarithm (e≈2.7182814)
tech.	transcendental number, base of natural logarithm (ε, 超越数); Napierian base; natural base
自然对数的底超越数，等于2.7182318285
math.	transcendental number, the base of natural logarithm; transcendental number, base of natural logarithm (ε)
number 2.7182814+自然对数的底等于2.7182814 +
gen.	base of Naperian or natural system of logarithms