"So very seldom do people at that moment make the decision to donate their child's brain tissue for research, and in the absence of brain tissue for research, it goes very slowly," he said.
“因此，在这种情况下很少人会将孩子的大脑捐献用于研究，并且由于缺少可研究的大脑，这项研究进展的十分慢，”他说。
That is to say, when humans evolved without a particular switch, the absence of that switch allowed the brain to grow further.
也就是说，人类在进化中丢弃了这个特殊的开关，而这个缺失的开关让大脑能发育更高级。
Neurons in that brain region showed activity that signaled depth perception even in the absence of other cues.
这个部分的神经甚至在没有其他信号作用的时候（也就是说睁开一只眼的时候）依然显示出了感知深度的活动。
Stieg says in the absence of definitive evidence linking cell phones to brain tumors - he suggests people continue to use their cell phones as they are.
Stieg说由于手机跟脑癌之间的关系缺乏明确的证据，他建议人们继续像正常一样使用手机。
Dementia of the aged; results from degeneration of the brain in the absence of cerebrovascular disease.
老年人的痴呆；由于脑血管的疾病而导致大脑衰退。
In the absence of oxygenated blood, brain cells quickly die.
在没有氧合血，脑细胞迅速死亡。
Despite being a neurodegenerative disease, preservation of brain weight and a conspicuous absence of neuronal or glial cell death were signal features of this disease.
尽管这是一种神经退行性疾病，脑量的保持和明显的神经元的缺失，或者胶质细胞死亡是这类疾病的显著特征。
In the absence of a defibrillator, CPR can keep blood flowing to the heart and brain until paramedics can arrive with the device.
如果没有除颤器，CPR(心肺复苏术)也能够促使血液继续流向心脏和大脑，以维持到医疗救护员携带设备赶到。
In the absence of a defibrillator, CPR can keep blood flowing to the heart and brain until paramedics can arrive with the device.
如果没有除颤器，CPR(心肺复苏术)也能够促使血液继续流向心脏和大脑，以维持到医疗救护员携带设备赶到。
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