hermetically sealed

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Access into Gaza and trade across a border that was once hermetically sealed by Israel are growing.
曾被以色列封锁的进入加沙的通路以及边界贸易现在得到了蓬勃发展。
One digital industry that learned this lesson long ago is the video-game sector, which excels at creating electronic environments hermetically sealed off from the outside world.
数码工业界多年前就在视频游戏产业学到了一课，这一产业擅于打造与外界隔绝的密闭的电子环境。
All of the mail has been very well preserved because the container was hermetically sealed.
由于那只集装箱的密封性极佳，所以时至今日里面的邮件依然保存完好。

It would not be a hermetically sealed conversation (for the most part) between the meter and the utility.
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One answer is to use the energy to compress air, which can be squirrelled away in hermetically sealed underground caverns.
ECONOMIST: Compressed air might help to make wind power more reliable
At the same time, you know, I don't think of what I do - I don't do it in a hermetically sealed chamber.
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A hermetically sealed container or space is so tightly closed that no air can leave or enter it.