方法用扫描电镜的方法观察了人胎儿菱形窝室管膜的超微结构。
Methods The ultrastructural feature of the rhomboid fossa in human fetus were examined by scanning electron microscopy.
上管是菱形截面，增强的背脊硬度抵抗最激烈的攀登中产生的弯曲和扭转力。
The top tube is an enhanced diamond oval with ridge stiffeners that counters the side-to-side flex and torsion of even the most aggressive climb.
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