All confirmed cases in the cluster can be directly linked to close and prolonged exposure to a patient during a phase of severe illness.

该群集中的所有确诊病例可直接与长期密切接触处于疾病严重阶段的患者相联系。

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It is difficult to show that an intervention prevents cancer, given the relatively long induction phase between exposure to an inducing agent and development of disease.

很难说一种干预方式，施予一段相对较长的介于接受诱导剂和诱发疾病之间的诱导治疗期，可以预防肿瘤。

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Fly on nonstop RoutingsMost accidents occur during the takeoff, climb, descent, and landing phase of flight so flying nonstop would reduce exposure to these most accident prone phases of flight.

选择直飞航线大多数空难发生在起飞、上升、降落或是着陆阶段，所以尽可能选择直飞来减少可能导致多发事故的环节。

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BioSante reported that with 2, 869 women enrolled and over 3, 000 women-years of exposure in it LibiGel Phase III cardiovascular and breast cancer safety study, there have been 17 adjudicated cardiovascular (CV) events, with a lower than anticipated event rate of approximately 0.57 percent.

FORBES: BioSante's Pollyannish Press Release

The second phase, which occurs 12 to 24 hours after exposure, involves the recruitment of inflammatory cells to the site of inflammation.

BBC: NEWS | Health | Eyelid protein is key to allergy

The first phase involves an immediate hypersensitivity reaction within one hour of exposure to an allergen.

BBC: NEWS | Health | Eyelid protein is key to allergy