Some researchers have hypothesized that it is the cumulative binding of adenosine to a large number of sites that causes the onset of sleep.
一些研究人员假设，腺苷与大量位点的累积结合导致了睡眠的开始。
Sea cows were totally dependent on kelp for food, and within a decade of the onset of otter hunting, Steller noted that the islands' sea cows appeared malnourished.
海牛完全以海藻为食，在捕猎水獭开始的十年里，斯特勒注意到，岛上的海牛似乎营养不良。
This marsupial inhabits the deserts of central Australia where the onset of rains and the resulting sudden growth of vegetation are extremely unpredictable.
这种有袋类动物生活在澳大利亚中部的沙漠中，那里的降雨和植被的突然生长是极其不可预测的。
Most of the passes have been closed with the onset of winter.
随着冬天的来临，大多数的关卡都已经关闭。
Another important push was the onset of the Little Ice Age, a climatic phenomenon that led to cooler temperatures in the Northern Hemisphere.
另一个重要的推动因素是小冰期的开始，这一气候现象导致北半球气温下降。
"If this test could predict the onset of GVHD before the rash develops, it could be extremely valuable, " he says.
他说：“如果这种检测能够在皮疹显现之前预测移植物抗宿主病的发病，那将是非常有价值的。”
A recent study suggests that vitamin E supplements, despite widespread belief in their efficacy, are no better than sugar pills for delaying the onset of the degenerative disease.
最近的一项研究表明，尽管人们普遍相信维生素E补充剂的功效，但在延缓退行性疾病发病方面，维生素 E 补充剂并不比糖丸效果更好。
The researchers examined how the onset of four serious physical illnesses affected marriages.
研究人员调查了四种严重的身体疾病是如何影响婚姻的。
Pubarche refers to the onset of pubic hair growth.
阴毛初现指的是阴毛开始生长。
The timing of the onset may also be important.
开始的时机也是很重要的。
At the onset of a project, nothing is known for sure.
在项目的开始，不能确定任何事。
Take them at the onset of cold or flu-like symptoms.
出现感冒或类似流感症状时就服用。
Bilingualism even seems to delay the onset of dementia in old age.
双语能力似乎还能够延迟老年痴呆症的发病时间。
At the onset of a development project, there is project uncertainty.
在开发项目的开始阶段，存在项目不确定性。
Death usually occurs three to six days after the onset of symptoms.
死亡往往发生在出现症状3至6天后。
The current average age for the onset of puberty for girls is 10.75.
目前女孩青春期的平均年龄是10.75岁。
As surprising as the onset of the Asian crisis has been its aftermath.
与它的爆发一样，此次亚洲金融危机的结果也非常出人意料。
I ask questions about the reasons for the onset of symptoms at a particular time.
我的问题是关于症状在特定时刻发作的原因。
The best home remedy for colds is to eat two cloves of raw garlic at the onset of symptoms.
家庭治疗感冒最好的方法就是在出现感冒症状的时候，生吃两瓣大蒜。
There are fears that with the onset of the rainy season the cholera will continue to spread.
人们担心，随着雨季的到来，霍乱还会继续扩散。
From the onset of the crisis, FAO has been a key player in coordinating emergency activities.
自危机开始以来，粮农组织在协调紧急活动方面一直是一个主角。
Clean water has become scarce and will become even scarcer with the onset of climate change.
清洁饮水已经成为稀缺资源，而且随着气候变化的到来将变得更加稀缺。
This approach requires that all the tasks and their durations be known at the onset of the project.
该方法要求在项目的开始就知道所有的任务及其持续时间。
Global poverty and hunger were steadily declining prior to the onset of the food crisis in 2007.
2007年粮食危机爆发之前，全球贫困和饥饿问题稳步减轻。
Many kids announce the onset of adolescence with a dramatic change in behavior around their parents.
很多孩子进入青春期，首先会在对待父母的态度上出现巨大变化。
Many kids announce the onset of adolescence with a dramatic change in behavior around their parents.
很多孩子进入青春期，首先会在对待父母的态度上出现巨大变化。
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