英和和英

a prerequisite

something that is indispensable

position or line of employment

to be necessary

the matter which must be addressed

something that is required in advance

according to the need

a thing which must be done

act in advance of

belonging to the front part

out into view

to go ahead

It's necessary.

to lead the rest―lead the way―take the lead―precede the rest

do the necessary

consider obligatory

to be suitable for

to forestall one―anticipate one―get the start of one―steal a march on one―be beforehand with one

to forestall one―anticipate one―get the start of one

just as it should be

to suit the exigency

travel in front of

It is necessary.

be obligated to do

something you have to do

state of making necessary arrangements beforehand

that should be done

in a preferential manner

to be pressed by necessity

be surplus to requirements