under lock and key

基本解释

I keep a lot of things under lock and key - most foodstuffs, cleaning materials, the hamster.
我把家裡的很多東西都鎖起來---大多數是食品，洗滌用的東西，還有我們養的倉鼠。
For they, according to Fisher, tend to keep their emotions under lock and key, while I’m much more of a die-hard romantic.
因爲根據費雪理論，這種類型的人往往將自己的情緒暗藏深鎖起來，而我卻是一個崇尚浪漫的人。
In practice, you should place the certifier under lock and key and may even put a guard (an actual person!) in charge of handing out the key via a very controlled mechanism.
實際上，您應該把証明鎖起來再放上警衛（真正的人！），通過嚴格控制的機制傳遞鈅匙。

The former partners tried to keep Cawley's new claims under lock and key at the courthouse.
FORBES: Magazine Article
In its quarterly Inflation Report it signalled that the door remains under lock and key.
ECONOMIST: The Bank is in no hurry to raise the price of money
Some publish their maps on the Internet, while others, like Greenwich, keep them under lock and key.
NPR: Security Officials Seek to Block Some Online Maps

locked away safely
If a person, especially a criminal, is under lock and key, they are being kept in a place from which they cannot escape, usually a prison.