If something is secret, it is known about by only a small number of people, and is not told or shown to anyone else.
Soldiers have been training at a secret location.
士兵们一直在一个秘密的地方训练。
secrets
A secret is a fact that is known by only a small number of people, and is not told to anyone else.
I think he enjoyed keeping our love a secret.
我想他喜欢对我们的恋情保密。
If you say that a particular way of doing things is the secret of achieving something, you mean that it is the best or only way to achieve it.
The secret of success is honesty and fair dealing.
成功的秘诀是诚实和公平交易。
Something's secrets are the things about it which have never been fully explained.
We have an opportunity now to really unlock the secrets of the universe.
我们现在有机会真正揭开宇宙的奥秘。
in secret
If you do something in secret, you do it without anyone else knowing.
Dan found out that I had been meeting my ex-boyfriend in secret.
丹发现了我一直和前男友秘密见面。
keep a secret
If you say that someone can keep a secret, you mean that they can be trusted not to tell other people a secret that you have told them.
Tom was utterly indiscreet, and could never keep a secret.
汤姆一点儿都不慎重,从来守不住秘密。
make no secret
If you make no secret of something, you tell others about it openly and clearly.
His wife made no secret of her hatred for the formal occasions.
他的妻子毫不隐瞒她对正式场合的厌恶。