The batteries are designed to be leak-proof and hermetically sealed.

这些电池的设计防渗漏，且密封性强。

《柯林斯英汉双解大词典》

Then social progress stopped - a study comparing the fate of children born in 1958 with those born in 1970 shows the latter more hermetically sealed into the social class of their birth.

于是社会停止了进步——有一项研究比较了分别出生于1958年和1970年的孩子的命运，发现后者被出身束缚得更紧。

youdao

Unit is hermetically sealed to assure maximum reliability under extreme environmental conditions.

该设备是完全密封的，确保在极端严苛的环境条件下的最大可靠性。

youdao

It would not be a hermetically sealed conversation (for the most part) between the meter and the utility.

FORBES: The Economist: Innovation Almost Dead. Perhaps Not So In Electricity

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

None of this would matter if the stock markets were in a hermetically sealed box, labelled speculation, insulated from the real economy.

BBC: How to catch a falling knife