英和和英

an intrepid explorer

an explorer

an adventurous explorer

audacious explorers

adventurous pioneers

to open the curtain―raise the curtain―draw （back） the curtain

open wide

to hold a fair

to hold an exhibition

to disclose

heroic explorers

The curtain rises

The performance commences.

The plays begins

a hardy explorer

the finder

open to the view

to hold a meeting

reeve an opening

to extract the square root （of a number）

slide a drawer out

to make a beginning―pave the way for something

to pave the way for something

to open a package

undo the parcel

to open widely

open ranks

an ingenious researcher

an investigator

to burst open