The two sides of the brain are connected by a large bundle of connecting fibers called the corpus callosum. This was the area that was underdeveloped.
大脑两侧通过一大束被称之为胼胝体的连接纤维互相连接，这就是所提到的欠发达的大脑区域。
The development of elementary English education in underdeveloped area falls far behind developed area.
欠发达地区基础英语教育落后于发达地区。
The cultural construction of the rural area in west China is comparatively underdeveloped.
我国西部农村的文化建设相对滞后。
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