Many large institutions keep this kind of data secret—or at least make it incredibly difficult to find.

许多大型机构都对这类数据保密，或者至少使其难以被找到。

youdao

To be honest, I never meant to keep my being a crime writer a secret or anything, and my friends have always known.

说实话，我从来没有想过要把我作为犯罪小说作家的身份保密，我的朋友们一直都知道这一点。

youdao

Do you always celebrate your birthday or do you cringe and keep it a secret since you are another year older?

你经常庆祝生日吗？或者因为你长大了一岁，所以厌恶它，让它成为一个秘密。

youdao

There is no need to keep it a secret, or keep it under your hat.

VOA: special.2010.05.09

Providing a service to companies or groups who want to keep their data secret or publish it on the web without censorship is proving a worthwhile enterprise.

BBC: Web rebels profit from net controls

He argues that a hacker could use a secret exploit to gain access to an iPhone or iPad and then install evasi0n, using the jailbreaking tool to hide his or her tracks and keep the secret exploit technique undiscovered by Apple and unpatched.

FORBES: Apple Is Beta-Testing An Update That Kills Evasi0n Jailbreak

The city's health code specifically forbids it, forcing pig owners in the nation's largest metropolis to keep their swine secret or take the risk an unhappy neighbor might squeal.

WSJ: Pigs May Fly Before Finding a Legal Home in the City