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The limit for occupational radiation exposure among workers who deal with radioactive material is 50 millisieverts.

对于职业的处理放射性物质的工人，接触辐射的极限是50毫西韦特。

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Part of the trick was to find a suitable photochromic material whose clear and opaque parts would remain stable after the initial exposure to light.

成功实现这一过程的部分关键在于找到合适的光敏材料，其在最初曝光之后透明与不透明区域都应保持稳定。

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Well really, the things we've looked at thus far can you do after just a semester of this kind of material and exposure to this particular world.

当结束这样一门课时,你是不是能通过学习和接触计算机科学,也做出我们刚刚看到的这些东西。

哈佛公开课 - 计算机科学课程节选

The cosmonauts were unable to collect a material exposure experiment from the station exterior due to a stuck hinge that prevented it from folding closed, NASA officials said.

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As process manufacturers, chemicals companies are on the upstream side of the overall consumer value chain, with heavy exposure to raw material pricing and energy costs.

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Brickman is an expert on asbestos litigation, where scores of companies have been forced into bankruptcy by thinly documented claims from people who claim exposure to the deadly fireproofing material.

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