在双曲拱桥中主拱圈的横截面是由数个横向小拱组成，这些小拱称为拱波。对于多肋多波截面拱波的跨径一般为1.3~2.0米，厚度为60~80毫米对于少波和单波截面，拱波的跨径一般为3~5米厚度为60~80毫米。
显然，斯波蒂陪着布朗尼，保护它免遭其他捕食动物的侵袭，夜间偎依着它为它驱寒，用鼻口拱它振作它的精神。
Spotty had evidently stayed with Brownie to protect him from predators2, snuggling with him at night to keep him warm and nuzzling3 him to keep his spirits up.
显然，斯波蒂陪伴着布朗尼，以免其他捕食动物侵袭他，夜里偎依着他，把温暖送给他，用鼻子拱他使他振作精神。
Spotty had evidently stayed with Brownie to protect him from predators, snuggling with him at night to keep him warm and nuzzling him to keep his spirits up.
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