英和和英

metrically incomplete

the essential factor

the leftmost non-zero digit

an indispensable implement

anything that is not essential

to a vital degree

custom duty unpaid

an indispensable dictionary

of a thing, being mandatory

an optional extra

an optional extra

absolutely essential

a superfluous part of something

an incomplete regulation

be the essential element

failing in what duty requires

a boundary which must not be passed

a mandatory clause

lacking the necessary characteristics

a nonexistent goal

a non-absentee

a non-absentee

be surplus to requirements

an irreducible formula

non-performance of an obligation

breach of a duty

not necessary

unanalyzed data

an unadjusted figure of 8.5 percent

a sizeable obligation