Interest payments and principal security appear adequate for the present but certain protective elements may be lacking or may be characteristically unreliable over any great length of time.
目前，看来仍足以支付利息与保障本金，但是若干保持因素可能缺乏，或经长时间以后，可能无法信赖。
Principal requirements for flame plume length in end port glass-melting furnace were set forth.
提出了对马蹄焰池窑内最佳火焰长度的要求。
Focal length: The distance between the centre of a lens and its principal focus.
焦距：镜头中心与其主焦点的距离。
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