目的：探讨脑外伤后进行脑组织移植的适宜时期。
Objective: To explore the suitable time for fetal neocortex transplantation after frontal cortex injury in rats.
利用冠层反射光谱监测叶片碳氮比的适宜时期为孕穗期至吐丝期。
The proper time for monitoring leaf soluble sugar to nitrogen ratio should be from booting to silking stage.
1990年以来，世界经历了几个有趣的时期，发生的事件并不波澜壮阔，涉及的人物也不是久远的古人，因此不适宜做戏剧性的描写。
The world has been through interesting times since 1990, but the events and characters are less striking and too recent to make for a rich dramatic narrative.
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