top secret

of the highest category of secrecy 最高机密的; 绝密的: a file of top secret information 一份绝密资料.

took, tool, tools, toot, tooth, tooth-powder, toothache, toothbrush, toothed, toothily, toothless, toothpaste, toothpick, toothsome, toothy (-ier, -iest), tootle, top, top drawer, top gear, top hat (also topper), top ten, top twenty, top-boot, top-dress, top-dressing, top-flight, top-heavy, top-notch, top-ranking, top-up, topaz, topcoat, topi, topiary, topic, topical, topicality, topically, topknot, topless, topmost,