Design plays a key role in Halden 's23 rehabilitation efforts.

设计在哈尔登监狱对囚犯的改造努力中扮演着关键角色。

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Halden, Norway's second largest prison, with a capacity of 252 inmates, opened on April 8.

作为挪威第二大监狱，哈尔登监狱在4月8日落成，可容纳252名囚犯。

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At Halden, half of all guards are female, which its governor believes reduces tension and encourages good behavior.

在哈尔登，有一半狱警是女性，监狱长官认为这可以缓和紧张局势，鼓励良好行为。

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For example, No. 7, says Dr. Halden, means "there is a high likelihood" that Bisphenol A is in it.

WSJ: Is It Safe to Heat Food in Plastic?

While the recycling numbers at the bottom of plastic items "are not meant to provide health information or risks, " Dr. Halden says, they can sometimes provide clues to the chemicals in them.

WSJ: Is It Safe to Heat Food in Plastic?

Phthalates, the chemicals that make a PVC container flexible, "can migrate out of the plastic when it's heated, " says Dr. Halden, who has done comprehensive studies on emerging contaminants and plastics for more than a decade.

WSJ: Is It Safe to Heat Food in Plastic?