under lock and key 妥善保管
英文释义In a well-protected, very safe place.
例句 The famous chef keeps his best recipes under lock and key so no one will steal them.这位名厨妥善保管着他的最佳菜谱,没有人能偷走。
本文链接:https://www.penhen.com/shangwuyingyu/shangwukouyu/153961.html