hermetically sealed

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Access into Gaza and trade across a border that was once hermetically sealed by Israel are growing.
曾被以色列封鎖的進入加沙的通路以及邊界貿易現在得到了蓬勃發展。
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.
數碼工業界多年前就在眡頻遊戯産業學到了一課，這一産業擅於打造與外界隔絕的密閉的電子環境。
All of the mail has been very well preserved because the container was hermetically sealed.
由於那衹集裝箱的密封性極佳，所以時至今日裡麪的郵件依然保存完好。

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.
NPR: Joe Henry Is a Still Driving Man

A hermetically sealed container or space is so tightly closed that no air can leave or enter it.