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。
2
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。
3
Focal length: The distance between the centre of a lens and its principal focus.