trade secret

1 device or technique used by a firm in manufacturing its products, etc and kept secret from other firms or the general public 行业秘密. 2 (fig infml 比喻, 口) fact, etc that one is not willing to reveal （个人不愿透露的）秘密.

track down, track events, track out, track record, track suit, tracked, tracking station, tract, tractability, tractable, traction, traction-engine, tractor, tractor-trailer, trad, trade, trade gap, trade mark, trade name, trade price, trade wind, trade-in, trade-off, trade-unionism, trade-unionist, trademark, trader, Trades Union Congress (abbr 缩写 TUC), tradesman, trading, trading estate, trading post, trading stamp, tradition, traditional, traditionalism, traditionalist, traditionally, traduce, traducer,