安全部门窃听电话是一个公开的秘密。
It's an open secret that the security service bugged telephones.
控制器面对网络攻击显示出脆弱性是一个公开的秘密。
The vulnerability of the controller to cyberattack was an open secret.
谷歌和脸谱很难是最好的朋友，这在科技界是一个公开的秘密。
IT IS an open secret in the tech world that Google and Facebook are hardly the best of friends.
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