Really, the safe level of exposure is no exposure.

吸烟真正的安全水平就是一点儿都不吸。

youdao

The prisoners had no exposure tonatural light, making it impossible for them to tell if it was night or day.

囚犯无法接受到自然光，自然就没有办法分辨白天和黑夜。 他们只被允许和戴着面具，从来不说话的守卫接触。

youdao

"There was no exposure to the outside world, " he said, describing the insularity of that milieu. "You break the rules, you're out.

“在那个家里，你无法接触外面的世界，”他这样描述那里与世隔绝的生活状态，“你打破了规定，就得离开。

youdao

But clearly there is no such thing as a safe level of cigarette smoke exposure.

VOA: special.2009.06.03

One is there's no lag period, notice that antibody levels start rising right away after the second exposure.

第一是没有迟滞期,请注意,抗体浓度迅速上升,在第二次接触抗原时

耶鲁公开课 - 生物医学工程探索课程节选

This will prove useful to investors looking for companies with little or no exposure to Southeast Asia and Europe.

FORBES: How To Find Clarity Among Mixed Economic Results

European bees had no exposure to it and no ability to handle it.

CNN: Unwelcome visitors cause havoc for bees

In addition, third parties with no exposure to the particular credit risk can bet on whether the Greeks will default.

FORBES: Credit Derivatives Don't Kill Countries, Politicians Do