Perchloroethylene is a known carcinogen and even short term exposure to it can cause all sorts of central nervous system related problems.

氯乙烯是一种已知的致癌物质，甚至短期内接触到它能够引起各种中枢神经系统的相关问题。

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So if you can, temporarily limit your exposure to their mood swings in hopes that this is just a short term issue.

所以如果能的话，在他们情绪波动时暂时减少和他们的接触，希望这只是短期的问题。

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"It is probably a long-term effect of early-life exposure to natural light that increases the chances of a child becoming short-sighted," he says.

“早期暴露在自然光线中可能会产生长期的影响，增加孩子患近视的可能性，”他说。

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That EPA rule was designed for a lifetime of exposure, the IAEA guideline for short-term exposure.

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Acute (short-term) inhalation exposure to high levels of 1, 4-dioxane has caused vertigo, drowsiness, headache, anorexia and irritation of the eyes, nose, throat, and lungs in humans.

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It delivers sand under long-term, "take or pay" contracts that reduce the company's exposure to short-term fluctuations in the price of sand.

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