怪獣島の秘密の英語

an imaginary island where devils live, named {Onigashima}

a hidden cave

an unknown island

a guard of an island

undiscovered islands

the shape of an island

to confide a secret to one―disclose a secret to one―divulge a secret to one―reveal a secret to one―unbosom oneself of a secret to one―unburden oneself of a secret to one―disburden oneself of a secret to one―let one into the secret

to disclose a secret to one―reveal a secret to one―divulge a secret to one―confide a secret to one―unbosom oneself of a secret to one―unburden one's heart of a secret to one―let one into the secret

a close secret

tropical islands

an island in the embrace of the sea

something that is kept secret

The secret has leaked out―oozed out―transpired.

a curtain of secrecy

Absolute secrecy is preserved.

secret guilty deeds

backstairs intimacies

to expose a secret

to be able to see through a secret or a trick

to keep the matter （a） secret―preserve secrecy

The Secret of the Stone Garden

insular territories

A secret transpires.

an imperial edict secretly issued

a group of islands

an island of Japan called Tanegashima island

to disclose a secret―divulge a secret―reveal a secret

in secrecy

a scandal that is kept secret

an imaginary isle which is said to be inhabited by only women