Recycled air in office buildings and enclosed work areas can be very unhealthy.

在办公建筑或封闭工作区内的"二手"空气往往很不健康。

youdao

The other toxic materials are well enclosed and should pose little risk to users, but they could be released into the air or waterways during manufacture or disposal.

而其他有毒物质被很好的密封在电视机内，对用户的危害很小，但这些物质也有可能在制造或丢弃的过程中，释放到空气和水中。

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Two visitors at a time can poke their heads into his inflatable textile construction, sharing the air they breathe in the enclosed pod-like space.

每次可以有两名参观者把头伸进充气的纤维结构物体中，分享封闭空间的空气。

youdao

The goods are far cheaper than in the souks of the cities and browsing through the stalls is a breath of fresh air from the enclosed shopping malls of Dubai.

BBC: Along Arabia��s east coast

In terrariums, people use any plant that survives well in enclosed areas, including succulents, air plants -- plants that receive their nutrients from the air -- palms and begonias.

CNN: Terrariums make it big by going small