根据美国宇航局的要求，为了保护这些石英玻璃窗不被轨道碎片击碎，它们大部分时间应该处于关闭状态。
For now, NASA wants to keep them shuttered most of the time to protect the fused silica glass from orbital debris.
究其原因主要是由于超早期诊断困难，溶栓及神经保护治疗的个体时间窗不明和缺乏特效的药物。
The reason lies in the difficulty of super early diagnosis, insensibility of the window time of nerve protective therapy, dissolution of thrombus and absence of special effective drugs.
联合应用不同类型神经保护剂和凋亡抑制剂可一定程度扩大有效治疗时间窗。
In some degree, the TTW will be extended while combined different neuroprotective agents and antiapoptosis.
联合应用不同类型神经保护剂和凋亡抑制剂可一定程度扩大有效治疗时间窗。
In some degree, the TTW will be extended while combined different neuroprotective agents and antiapoptosis.
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